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Nagayoshi Ohashi (ASIAA)5/15/26, 1:45 PMOral
As an extension of the ALMA Large Program Early Planet Formation in Embedded Disks (eDisk), we are conducting a survey of a homogeneous sample of 25 protostars in the Ophiuchus star-forming region (eDisk@Oph). The targets were selected from the Spitzer c2d catalog based on their bolometric luminosities and near-infrared spectral indices. The primary scientific objective of this project is to...
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YU-SYUAN TU (中研院天文及天文物理研究所(ASIAA))5/15/26, 2:00 PMOral
HH 212 is a nearby protostellar jet driven by the Class 0 protostar IRAS 05413–0104, exhibiting a highly symmetric morphology with well-defined knot structures close to the disk. Previous ALMA observations have mapped HH 212 in the SiO J = 8–7 transition (Band 7). Here, we present the first high-resolution observations of the higher-J transition, SiO J = 16–15 (Band 9).
We find that the...
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Daniel Harsono5/15/26, 2:15 PMOral
Sulfur is the tenth most abundant element in the universe. It is found in various biomolecules from amino acids to lipids. In space, most of the sulfur is thought to reside on and inside dust grains during the early stages of star and planet formation. Sulfur-bearing molecules have also been detected in comets. To better understand the sulfur trail from diffuse ISM to planet-forming materials,...
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Surojit Saha (Institute of Astronomy, National Tsing Hua University, Taiwan)5/15/26, 2:30 PMOral
Physics-informed neural networks (PINNs) have gained considerable importance in recent years in the domain of Astronomy \& Astrophysics, particularly as a potential tool to solve differential equations within the given boundary conditions, not only for making accurate predictions but also for providing an efficient approach for large computations. In this work, we have focused on solving the...
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Tomoki Wada (Tohoku Univ/ NCHU)5/15/26, 2:45 PMOral
The precise measurement of the Hubble constant remains a central challenge in modern cosmology, particularly given the tension between early-universe ( cosmic microwave background) and late-universe ( Type Ia supernovae) measurements. Independent probes are essential for clarifying the origin of this discrepancy. Fast Radio Bursts (FRBs) possess the potential to offer a unique alternative. The...
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Jia-Lun Li (清華大學天文所)5/15/26, 3:00 PMOral
Feedback from active galactic nuclei (AGN) is believed to play a significant role in suppressing cooling flows in cool-core (CC) clusters. Turbulence in the intracluster medium (ICM), which may be induced by AGN activity or pre-existing motions, has been proposed as a potential heating mechanism based on analysis of Chandra X-ray surface brightness fluctuations. However, subsequent simulation...
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Ing-Guey Jiang (National Tsing Hua University)5/15/26, 3:15 PMOral
The possibility that there is a third planet in Kepler-396 system was proposed, but not yet confirmed. In order to investigate this, and understand Kepler-396 system’s configuration, new TESS data are employed to form a long baseline transit timing. Our results support the existence of a third planet. With updated parameters, the planet properties are further investigated. In addition, as...
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Aiswarya Sankar Kachiprath (National Central University)5/15/26, 4:30 PM
We present a comprehensive analysis of the nearby Type-Ic superluminous supernova (SLSN) 2024ahr at a redshift of z = 0.086. The event exhibits an unusually high late-time 56Ni mass of ~5.5 M☉, derived from nebular spectral synthesis modeling, and shows notable similarities to SN 2007bi in both light curve evolution and spectroscopic properties. The light curve shows a pre-peak bump lasting...
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Sung-Han Tsai (ASIAA / NTU Department of Physics)5/15/26, 4:45 PM
Binary star interactions play a critical role in shaping the circumstellar medium (CSM) and influencing the observational properties of supernovae (SNe). This study focuses on the mass-loss processes in interacting binary stars with solar-like metallicity, particularly in the Case C systems where mass transfer occurs during the donor star's secondary expansion phase, which follows helium...
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Chang-Mao Yang (NTHU)5/15/26, 5:00 PM
Chiral effects induced by quantum anomalies, such as the chiral magnetic effect, are expected to influence the dynamics of core-collapse supernovae (CCSN). These effects arise in strong magnetic fields and rapid flows, which are common in supernova cores. In this work, we investigate the dynamical relevance of chiral neutrino radiation transport in CCSN, focusing on near-equilibrium...
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Yo-Yo Chu5/15/26, 5:15 PM
Identifying the progenitors of rapidly rotating core-collapse supernovae (CCSNe) is crucial for understanding the formation of magnetars and the origin of long gamma-ray bursts. In this study, we investigated the evolution of mass-transferring binary systems in a low-metallicity environment ($Z = 10^{-3}$) using the MESA stellar evolution code. We explored a parameter space with initial mass...
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Cheng-Han Lai (Institute of Astronomy, National Central University)5/15/26, 5:30 PM
The progenitor systems and explosion mechanisms of Type Ia supernovae (SNe Ia) are not yet fully understood. We aim to constrain them by analyzing the properties of their host galaxies, from which we can infer key information about the progenitors. In this study, we analyze the maximum light spectra of SNe Ia using data from ePESSTO+ from 2019 to 2023. We investigate the relationship between...
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Anirban Dutta (National Central University)5/15/26, 5:45 PM
The community has reached a consensus that thermonuclear supernovae are explosions of white dwarfs. But it is not known how an isolated white dwarf can explode. Most explosion scenarios involve white dwarfs in a binary to explain thermonuclear explosions. But the exact nature of the companion star, and the explosion mechanisms are not well understood. White dwarf supernovae are also important...
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44. Tracing Progenitor and Explosion Properties of Type Ia Supernovae with Swift Ultraviolet SpectraSnehasish Bhattacharjee (National Central University)5/15/26, 6:00 PM
We investigate the ultraviolet (UV) spectral properties of a large sample of Type Ia supernovae (SNe~Ia) observed with the {\it Swift} UltraViolet and Optical Telescope (UVOT) grism. This sample is much larger than our previous works and includes more early-time UV spectra. We investigate how the UV emission relates to $\Delta m_{15}(B)$, host-galaxy properties, and ejecta characteristics. We...
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164. Investigations for Historical Archival Records and Reconstructions of Centennial Solar ActivityProf. Hisashi Hayakawa (Nagoya University)5/16/26, 9:00 AMOral
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Kai-I Cheng (NTU/ASIAA)5/16/26, 11:00 AM
30 Doradus is one of the most active star-forming regions. In its main body, confirming supernova remnants (SNRs) remains challenging due to the highly ionized environment, strong thermal emission, and diluted optical shock diagnostics.
In this work, we present compelling multiwavelength evidence for an SNR located in Shell 1 within the main body of 30 Dor A, based on archival observations...
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Guan-Hong Li (National Tsing Hua University)5/16/26, 11:00 AMOral
This study investigates the origin of Odd Radio Circles (ORCs) by modeling them as remnants of active galactic nucleus (AGN) feedback using the JET semi-analytical framework. Motivated by observed host galaxy properties and recent simulations suggesting that ORCs represent relics of AGN activity following a phase of rapid supermassive black hole (SMBH) growth, we identify candidate hosts with...
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Raffaele Rani (NTHU)5/16/26, 11:00 AM
Understanding the turbulent structure of molecular clouds is essential for linking galactic environment to the regulation of star formation. While the turbulent properties of Galactic molecular clouds have been extensively investigated, direct observational constraints on turbulence modes in external galaxies remain limited.
In this work, we apply the statistical framework developed by...
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Mohammed Ramiz Aktar (Institute of Astronomy, National Tsing Hua University)5/16/26, 11:15 AM
We carry out three-dimensional radiation-relativistic magnetohydrodynamic (3D Rad-RMHD) simulations of accretion flows around spinning active galactic nuclei (AGNs). Our study focuses on the magnetically arrested disk (MAD) state, utilizing a single-temperature model that incorporates bremsstrahlung opacity as the sole radiation process while varying the black hole spin from non-spinning to...
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Chia-Yu Hu (Institute of Astrophysics, National Taiwan University)5/16/26, 11:15 AM
Chemistry in the interstellar medium (ISM) is the crucial link between theory and observations. While hydrodynamical simulations are the standard for forward modeling, they often lack the resolution to capture essential small-scale processes. In this talk, I will demonstrate that even in cutting-edge, high-resolution simulations (on parsec scales), sub-grid clumping remains a critical missing...
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Chiung-Yin Chang (National Tsing Hua University, Institute of Astronomy)5/16/26, 11:15 AMOral
Active galactic nucleus (AGN) feedback drives powerful outflows that play a crucial role in galaxy evolution. The physical origin of asymmetric outflow structures seen in observations remains unclear, as such asymmetries are often attributed to dust obscuration rather than being intrinsically produced. Recent infrared observations with JWST of NGC 7469, however, reveal intrinsically asymmetric...
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Yu-Hao Yao5/16/26, 11:30 AM
The evolution of globular clusters is an important topic in astronomy.
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Observational results suggested that the external tidal field will
affect the evolution of globular clusters significantly. Therefore, we
use the method of N-body simulations to investigate how various physical
parameters of a globular cluster—such as total mass, half-mass radius,
concentration parameter, and... -
Dr Che-Jui Chang (National Taiwan University)5/16/26, 11:30 AM
Supermassive black holes (SMBHs) like M87∗ and Sgr A∗ have been observed with the Event Horizon Telescope (EHT), facilitating the investigation of null geodesics near a black hole. The null geodesic around black holes and relevant features such as photon ring, lensing ring and black hole shadow, have been modelled analytically. The emission and absorption of plasmas surrounding a black hole is...
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Jie Shiuan Gong5/16/26, 11:30 AMOral
Fast radio bursts (FRBs) are millisecond-duration radio transients whose physical origin remains unknown. Different progenitor channels are expected to arise in distinct host-galaxy environments. However, most previous studies have been limited to analyses of entire host galaxies rather than the immediate environments of FRB sites. Spatially resolved studies are therefore essential for placing...
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CHUAN-KENG CHUANG5/16/26, 11:45 AMOral
Fast Radio Bursts (FRBs) are energetic, millisecond radio signals from cosmological distances. The nature of FRBs, especially their short duration, leads to a lack of well-localized FRBs, being the major challenge for studies on FRB progenitors. The key measurement is the delay time between FRB emergence and past star formation in their host galaxy, called the delay time distribution (DTD)....
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MIHIRKUMAR SANJEEVKUMAR TRIPATHI (National Tsing Hua University)5/16/26, 11:45 AM
Planets form within protoplanetary disks; therefore, understanding the diversity of planetary compositions requires studying how material is distributed and evolves within these disks. During their first million years, young disks remain embedded in the envelopes of natal molecular clouds and continue to accrete material. This accreting material alters the disk’s physical and thermal structure...
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Chieh-Yu Kuo (NTNU)5/16/26, 11:45 AM
Polarized emission from the vicinity of black hole systems carries essential information about local magnetic field configurations in the strong gravity regime. In this work, we employ unsupervised learning to a library of model GRMHD Stokes images of M87*, cluster the images based on the polarized image features, and explore how the clustering depends on the model parameters such as black...
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Ishika Palit (National Tsing Hua University)5/16/26, 12:00 PM
We investigate the impact of equatorial asymmetry in the magnetic field geometry on accretion dynamics around a spinning black hole using axisymmetric general relativistic magnetohydrodynamic simulations. We consider a Fishbone--Moncrief torus orbiting a Kerr black hole with spin parameter $a = 0.9375$, threaded by large-scale magnetic fields that are asymmetric about the equatorial plane. The...
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Shiang-Chih Wang (National Tsing Hua University/ ASIAA)5/16/26, 12:00 PM
The streaming instability (SI) is a key mechanism for forming kilometer-sized planetesimals from dust or pebbles in the core accretion scenario of planet formation. In disks with a radial pressure gradient, the SI can locally enhance the dust-to-gas ratio, leading to gravitational collapse and helping to overcome both collisional and radial drift barriers. Recent studies have identified a new...
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Yu-Ling Chang5/16/26, 12:00 PMOral
The physical origins of the cool gas traced by Mg II absorption lines around massive galaxies remain an open question. Previous studies have suggested that the cool gas around luminous red galaxies (LRGs) may be associated with their satellite galaxies. In this talk, I will present our effort to test this scenario. We use the largest sample of LRG–QSO pairs from the Dark Energy Spectroscopic...
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Pin-Hsien Lai (Graduate Institute of Astronomy, National Central University)5/16/26, 1:45 PM
We compared empirical RR Lyrae period-luminosity-metallicity (PLZ) and period-Wesenheit-metallicity (PWZ) relations that were calibrated using various RR Lyrae origins to evaluate the accuracy and validity of distance estimations. Our analysis employs RR Lyrae samples from various host systems, including the Large Magellanic Cloud, Draco dwarf galaxy, and globular cluster $\omega$ Centauri. We...
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I-Hsuan Li (National Cheng Kung University)5/16/26, 1:45 PMOral
We constrain the X-ray count rate-mass relation of 7408 RASS X-ray selected galaxy clusters at $0.05 < z < 1$. The sample is further optically confirmed based on the optical imaging from Legacy Survey DR9 and DR10, leading to a sample purity at $90\%$. We measure the weak-lensing shear profiles using the Hyper Suprime-Cam (HSC) Y3 data set, resulting in a total signal-to-noise ratio of $30.9$....
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Priyanka Jalan (Institute of Astronomy, National Tsing Hua University)5/16/26, 1:45 PM
We investigate the physical drivers of active galactic nucleus (AGN) luminosity and its connection to host galaxy evolution across cosmic time using a multi-wavelength dataset from the \textit{James Webb Space Telescope} (JWST) SMILES and JADES surveys. Our sample consists of 2,735 galaxies spanning lookback times from 0.8 to 13.6 Gyr ($z \gtrsim 0$--17), with robust spectral energy...
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Shih-Ying Hsu (ASIAA)5/16/26, 2:00 PM
Proto-binary and proto-multiple systems with close separations are particularly valuable targets for investigating chemical inheritance and reaction, as their members are expected to form from similar material in their parental cloud. Complex organic molecules (COMs) in young stellar objects (YSOs) have attracted significant attention due to their potential connection to pre-biotic chemistry...
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Yi-Chi Chang (Institute of Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan)5/16/26, 2:00 PM
Identifying intermediate-mass black holes (IMBHs) is crucial for understanding the co-evolution of galaxies and the seeds of supermassive black holes. We present a comprehensive multi-wavelength analysis of IC 1633 X-4 (2CXO J010952.3-455526), a hyperluminous X-ray source projected at the outskirts of the galaxy IC 1633 (z $\approx$ 0.024). By combining optical photometry from HST/WFPC2 with...
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Wen-Chi Hua (National Cheng Kung University)5/16/26, 2:00 PMOral
We aim to measure the stellar mass content and luminosity function of 6,439 X-ray selected galaxy clusters from the all-sky RASS-MCMF catalog, using WISE W1 (3.4 μm) photometric data. Our sample spans a mass range of $10^{13}M_\odot \lesssim M \lesssim 10^{15}M_\odot$ and redshifts $0.05 <z_{cl}< 0.4$. We use the unWISE catalog with a limiting magnitude of W1 ≈ 20.45 mag.
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In our work, we... -
Rajashree Bhuyan (National Taiwan University, Department of Physics)5/16/26, 2:15 PMOral
Recent observations with the James Webb Space Telescope (JWST) are revealing an increasing number of quiescent galaxies that had already stopped forming stars when the Universe was only a few billion years old. Given the limited time available for secular evolution at these early epochs, the existence of such quenched systems suggests that their star formation was abruptly shut down....
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Jun Hashimoto5/16/26, 2:15 PM
Substructures are ubiquitous --- nearly 60\% of protostellar disks, which is less than 1 Myr, host features such as rings/gaps, spirals, and crescents. These features are widely interpreted as evidence for embedded giant planets, suggesting that planet formation occurs much earlier than previously thought. However, previous observations have been biased toward bright, large disks, even though...
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Dipak Debnath (National Tsing Hua University)5/16/26, 2:15 PM
GS 1354-64 is a dynamically confirmed Galactic transient black hole. Recently, it exhibited a bright outburst. We study the temporal, spectral, and polarimetric properties of the source using multi-satellite data. The outburst consists of two short-duration ($\sim 3$-$5$ days) bright X-ray flares, with peak fluxes of 1.4 and 0.8 Crab, respectively. The source exhibits strong signatures of...
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Wei-Shan Su5/16/26, 2:30 PM
Stellar flybys are a common dynamical process in young stellar clusters and can significantly reshape protoplanetary discs. However, their impact on dust dynamics remains poorly understood, particularly in the weakly coupled regime ($\mathrm{St}≫1$). We present three-dimensional hydrodynamical simulations of parabolic stellar flybys—both coplanar and inclined—interacting with a gaseous and...
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Ashwin Aravindaraj (Institute of Astronomy, National Tsing Hua University)5/16/26, 2:30 PM
Supernova remnants (SNRs) are widely regarded as the primary sources of Galactic cosmic rays, with particles accelerated at their shock fronts through the diffusive shock acceleration (DSA) mechanism, gaining energy via repeated shock crossings. Magnetic turbulence plays a crucial role in scattering these particles, making its characterization essential for understanding the acceleration...
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Angel Rodriguez Barbosa (National Tsing Hua University)5/16/26, 2:30 PMOral
Active galactic nuclei (AGN) are pivotal drivers of galaxy evolution, yet many remain undetected in ultraviolet and optical surveys due to heavy dust obscuration. Tracking the AGN infrared (IR) contribution and number fraction (AGN fraction of IR-selected galaxies) provides insight into the dominance of AGN activity within galaxies and how common AGNs are across cosmic time. In these systems,...
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Jo-Shui Kao (NTHU/ASIAA)5/16/26, 2:45 PM
Magnetic fields play a crucial role in the process of star formation and the evolution of collapsing dense cores. However, direct measurements of magnetic field strength from observations remain challenging. The polarization–intensity gradient method is a new approach to estimate the magnetic field strength using polarization angle and intensity gradient, which can provide the map of...
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Dr Swadesh Chand (Postdoc, Institute of Astronomy, National Tsing Hua University)5/16/26, 2:45 PM
We present a comprehensive broadband spectral and timing study of the bright atoll neutron star low-mass X-ray binary GX~9+9 using two simultaneous NICER, NuSTAR, and MAXI observations obtained in 2019 and 2022. During both epochs, the source resides in the lower banana branch of the color–color diagram, consistent with a soft spectral state. The broadband spectra in the $0.7-40$ keV band are...
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Ryuichiro Hada (ASIAA)5/16/26, 2:45 PMOral
Accurate modeling of small-scale redshift-space clustering is crucial for full-shape RSD analyses, where satellite galaxies contribute to 1-halo terms and Finger-of-God distortions. We study halo reconstruction with the cylinder-grouping method of Okumura et al. (2017), which selects an effective halo-center tracer from the observed galaxy distribution. Using DESI-like LRG mocks from...
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Mr Deriyan Senjaya (Department of Physics NTHU Taiwan)5/16/26, 3:00 PMOral
The Fermi Paradox poses a fundamental question: why, given the immense age and scale of the Universe, have we not observed evidence of advanced civilizations beyond our own? Explanations range from sociological ideas such as the zoo hypothesis to the possibility that advanced civilizations are inherently undetectable. An alternative line of inquiry emphasizes astrophysical causes. Previous...
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Che-Yen Chu (National Changhua University of Education)5/16/26, 3:00 PM
Radio emission from magnetars is closely linked to their X-ray activity, yet the connection remains complex. Radio emission is typically observed during and after X-ray outbursts, exhibiting highly variable flux evolution, in contrast to the more monotonic decay seen in X-rays. In this paper, we present a phase-resolved X-ray spectroscopic analysis of the 2018 outburst of XTE J1810−197. Pulse...
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Rin Yamada (National Astronomical Observatory of Japan)5/16/26, 3:00 PM
Filamentary molecular clouds are now recognized as the fundamental structures that set the initial conditions of star formation. However, their formation mechanism remains an open question. Among the proposed scenarios, converging gas flows induced by colliding gas layers have emerged as a compelling candidate (Inoue et al. 2018; Arzoumanian et al. 2018, 2022), yet direct observational...
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Koothodil Abhijith Augustine (Institute of Astronomy, National Tsing Hua University, Hsinchu)5/16/26, 3:15 PM
Pulsars are critical laboratories for studying extreme particle acceleration, with the Crab pulsar serving as a benchmark across the electromagnetic spectrum. Observations in the MeV gamma-ray band ($0.2–5$ MeV) are essential for probing the spectral turnover where emission mechanisms transition. The upcoming Compton Spectrometer and Imager (COSI) will provide sensitive measurements in this...
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Atharva Patil (National Central University)5/16/26, 3:15 PM
Accurate u-band photometry in the Galactic plane is challenging because crowding, spatially variable extinction, and filter-system differences can strongly distort the observed stellar locus and complicate direct calibration. In this work, I develop an empirical framework for calibrating and interpreting CFHT u-band observations in heavily reddened fields by linking them to external optical...
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Tsz Hei Chan (NTHU)5/16/26, 3:15 PMOral
Accurate distance measurements are fundamental to understanding the formation and distribution of galaxies in the nearby universe. For faint and diffuse systems, such as dwarf and low-surface-brightness (LSB) galaxies, distances are needed to distinguish satellites from background systems, to derive physical properties such as mass and size, and to map the structure of the local volume (LV)....
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Milan Sil (Institute of Astronomy, National Tsing Hua University)5/16/26, 4:15 PM
The binding energy and desorption pre-exponential factor are key parameters in astrophysical ice chemistry, governing gas-surface processes that ultimately yield the astrophysical observations of a wide variety of gas-phase chemical species in cold environments (e.g., prestellar cores). Without accurate values, contemporary astrochemical models are compelled to rely on wild guesses, often...
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JR-YUE HSIANG5/16/26, 4:15 PM
We present the assessment of scientific capabilities of the Gamma-ray Transient Monitor (GTM) for observing the Crab pulsar. GTM is the science payload on board FORMOSAT-8B (FS-8B), a remote sensing satellite of Taiwan Space Agency (TASA) to launch in late 2026. Two modules of GTM detectors are mounted on opposite (+y and -y) sides of FS-8B, and each consists of four sensor units comprising...
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Kaustubha Sen (IoA, NTHU)5/16/26, 4:30 PM
This study reports the localization performance and detection efficiency analysis of a compact GRB monitor to fly on a future CubeSat. Our current study involves four model concepts of the instrument. Among them, two consist of four hexagonal CsI(Tl) scintillator detectors of geometric area 12.5 cm$^2$, read out by silicon photomultipliers (SiPM), encased in aluminum of 2-mm thickness on the...
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Cheng-An Hsieh (National Taiwan University)5/16/26, 4:30 PM
The atmospheric dynamics of Venus's mesosphere (60–120 km) present a long-standing scientific challenge, characterized by complex interactions between meridional circulation and photochemistry. A recent, unexpected observation revealed a massive increase in the gas-phase deuterium-to-hydrogen (D/H) ratio in this layer, rising from 162 to 1,519 times Earth’s standard between 70 and 108 km in...
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Prangsutip Cherdwongsung (National Tsing Hua University)5/16/26, 4:45 PM
The detection of exomoons, natural satellites orbiting exoplanets, remains one of the most challenging and intriguing problems in modern astronomy. In this work, we develop a photodynamical pipeline to search for exomoon signatures using transit timing variations (TTV). By analyzing periodic shifts in transit mid-times, we aim to identify the dynamical effects induced by a potential orbiting...
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Yu-Chiung Lin (National Tsing Hua University)5/16/26, 4:45 PM
Estimating the background noise power is essential for gravitational wave (GW) analysis. Typically, people compute the power spectral density (PSD) of the noise background using the Welch method, which is a sliding average over a long period of data, usually spanning tens to thousands of seconds. However, the detector strain data is non-stationary and sometimes glitchy due to the detector's...
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Nim Ki Wong (National Yang Ming Chiao Tung University)5/16/26, 5:00 PM
We present an automated noise subtraction pipeline combining Coherence Monitor (CohMon) and DeepClean for KAGRA’s O4a data. CohMon evaluates PEM sensors via frequency-domain coherence to select optimal witness channels. These feed into DeepClean, a 1D CNN, to model and subtract non-linear noise. Applied to O4a strain, it removes artifacts without altering astrophysical signals. Evaluated by...
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Roberto III Serrano (Rizal Technological University)5/16/26, 5:00 PM
A comprehensive catalog of Solar Radio bursts that is recorded from a Dual Dipole Antenna operating in Philippines at RTU Baras, specifically located the coordinates of 14°34′34.4″N, 121°15′53.3″E with a moderate elevation on the fringes of the Sierra Madre Mountain range. The antenna detects solar radio bursts between 16 MHz and 24 MHz using a calibrated software-defined radio (SDR) receiver...
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Dr Peter Lott (Phenikaa University)5/16/26, 5:15 PM
ravitational-wave astronomy has provided a unique probe into the dynamics of globular clusters, active galactic nuclei, and few-body gravitationally interacting systems. While binary black hole systems are a prevalent source of gravitational waves in ground-based interferometers, such systems could also be perturbed by the presence of a distant, third body, i.e. a supermassive black hole. Over...
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Cheng-An Hsieh (National Taiwan University)5/16/26, 5:15 PM
The recently discovered exoplanet WASP-193 b represents an extreme example of a “cotton candy” gas giant exoplanet, exhibiting an exceptionally low density (⍴=0.059±0.014 g·cm^-3) that current planetary evolution models cannot explain. With a Jupiter-like radius (R_p=1.464 R_{Jup}) but a mass of only 0.139 M_{Jup}, this highly irradiated planet (T_eq=1254 K) challenges our understanding of...
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Kaviya Parthasarathy (National Tsing Hua University)5/16/26, 5:30 PM
Transit Timing Variation (TTV) is a robust method for detecting
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non-transiting planets in multi-planetary systems, especially those near
Mean Motion Resonance (MMR). In this study, we focus on TOI-2109 b, one
of the few known exoplanets with an orbital period shorter than 1 day.
To achieve the precision necessary to detect these minute gravitational
perturbations, we integrated... -
Tetsuya Hashimoto (National Chung Hsing University)5/16/26, 5:30 PM
Fast Radio Bursts (FRBs) are luminous, coherent radio pulses primarily of extragalactic origin. While a Galactic magnetar has been linked to a few FRB-like events, the progenitors for the vast majority of FRBs remain elusive, largely due to the poor localization capabilities of current FRB instruments. To circumvent this limitation, we employ a statistical approach by investigating the...
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Mr Chakrapani Reddy (National Chung Hsing University)5/16/26, 5:45 PM
Fast radio bursts (FRBs) are bright millisecond-duration radio transients from distant galaxies, whose physical origin remains uncertain. Studying relations between burst properties, such as energy and intrinsic duration, may enable the use of FRBs as cosmological probes by providing luminosity distance estimates when combined with spectroscopic redshifts, without relying on the $H_0$--$f_{\rm...
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Hsin-Min Liu (NTHU)5/16/26, 5:45 PM
Transit light-curve observations play important roles in the study of
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exoplanetary systems as they enable the determination of physical and
orbital parameters of exoplanets through transit timing variations
(TTVs).
The TTV method is particularly powerful for detecting additional
low-mass planets within a system. In this work, we analyze 176 light
curves, including 132 from TESS and 12... -
Prof. Sebastien Charnoz (Université de Paris Cité)5/17/26, 9:00 AMOral
The formation of the first solids in protoplanetary disks sets the chemical foundations of planetary systems, yet their origin remains poorly understood. Classical models assume equilibrium condensation in a cooling gas, but increasing observational and cosmochemical evidence suggests that this assumption is not valid in dynamically evolving disks. Infrared observations (Spitzer, JWST) reveal...
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Yu-Chi Cheng (IANCU)5/17/26, 11:30 AM
We summarized our simulation results of the short-term dynamical evolution on 500 numbered Short-Period Comets over a 2000-year window (between 1000 and 3000 A.D.). To understand their evolution history, we classified the comets we studied into several groups based on the dynamical features: the recent semi-major/perihelion (a/q) jump, the Tisserand parameter reversion, and the temporary...
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Mr Yi-Hao Su (與AI探索天文(AstroEdu.AI))5/17/26, 11:30 AM
作為一個教育娛樂品牌，《與AI探索天文》想激發大眾的想像與創意。我會分享如何運用AI將遙遠的天文知識拆解、重組，連結到生活與不同領域，創造有趣的探索體驗，拉近大眾與星空的距離。
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Jacob Yen (ASIAA)5/17/26, 11:45 AM
AU-scale magnetic structures in the interstellar medium (ISM) — particularly current sheets formed at magnetic-field reversals — are predicted to strongly influence cosmic-ray transport, yet direct observations at these scales have remained inaccessible. Traditional Faraday rotation measure (RM) techniques lack the sub-parsec resolution required and are contaminated by ionospheric...
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Sze-leung Cheung (Ho Koon Nature Education cum Astronomical Centre)5/17/26, 11:45 AM
可觀自然教育中心暨天文館是香港一所成立30年的天文科普中心，每年接待超過3萬名學生及公眾，中心的0.5米望遠鏡剛剛退役並正更換成0.7米望遠鏡。2024年起，中心參加了香港賽馬會組織的探索科學活動，在全港小學推動探究式科學教育。報告會回顧可觀三十年由建台到今天的珍貴歷史，和介紹望遠鏡更新的經驗。
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Mr Sze-leung Cheung (IAU Comission C2 / WG on Star Names)5/17/26, 12:00 PM
本報告會介紹國際天文學聯合會C2天文普及委員會，以及恆星命名委員會的工作。這些恆星名稱涵蓋了多種文化地理和語言，包括古希臘語、阿拉伯語、漢語、達雅克語、荷蘭語、埃及語、英語、法語、希臘羅馬語、希臘語、梵語、拉丁語、馬來語、馬紹爾語、薩米語和蘇美爾語、科伊桑語。天文學和夜空在全球文化中都具有深遠的意義，而這種多樣性也凸顯了這一點。來自中國星名的恆星中有周、軍南門、帛度、屠肆左、衡、奎、 庫樓、豕目等。
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Dr Tomoki Matsuoka (The University of Tokyo / ASIAA)5/17/26, 12:00 PM
The presence of dense circumstellar medium (CSM) around core-collapse supernova (SN) progenitors has been universally realized lately through the radiative properties of SN-CSM interaction immediately after the explosion, although the physical origin of the CSM formation has not yet been established. Recent detections of significant polarization in early-phase Type IIP SNe 2023ixf and 2024ggi...
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Hsiang-Yu Chen (National Central University)5/17/26, 12:15 PM
When asked simple questions such as “How big is the Earth, the Moon, and the Sun?”, we can easily provide numerical answers: the Earth has a diameter of about 12,000 km, the Moon about 3,400 km, and the Sun about 696,000 km. However, for most of the public, these numbers remain difficult to understand, especially for those without a strong sense of scale.
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To promote astronomy education, the... -
Charles Mentzer (National Tsing Hua University)5/17/26, 12:15 PM
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous carbonaceous molecules in the interstellar medium, tracing the interaction between ultraviolet radiation fields and molecular material. In protoplanetary disks, they are widely used as diagnostics of disk surface chemistry, UV processing, and ionization structure. Using recently obtained JWST/NIRSpec and MIRI IFU observations of the...
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Majidul Rahaman (IoA, NTHU, Taiwan)5/17/26, 12:30 PM
Spiral structures and cold fronts in cool-core (CC) galaxy clusters are almost universally attributed to minor merger-induced gas sloshing. However, many CC clusters appear dynamically relaxed with no visible perturber, challenging this interpretation. Using three-dimensional cosmic-ray magnetohydrodynamic simulations of self-regulated AGN feedback in a Perseus-like cluster, we show that...
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En-Tzu Lin (National Tsing Hua University)Poster
The coincident observation of GW170817 and GRB170817A has provided unprecedented insight into the physical connection between binary neutron star mergers and short gamma-ray bursts.
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In this work, we perform a multi-messenger study with the aim of constraining the jet geometry of sGRBs, assuming that all BNS mergers produce relativistic jets. Our analysis incorporates gravitational-wave data... -
te chun wang (retired teacher)Poster
Starting from the relative description between expansion and contraction of space and matter, an atomic gravitational contraction picture is discussed on the possibility of interpreting the cosmic red-shift, instead of the current theory of the space expansion described by the Hubble's law. A contraction factor has been pointed out to compare with the current value of Hubble constant.
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Chen-Kang Pan (國立台東大學)Poster
The Antennae Galaxies (NGC 4038/4039) are among the nearest and most well-known interacting galaxy systems, making them an ideal laboratory for studying star formation and X-ray source populations in merging environments. In this work, we aim to combine Chandra,HST, and JWST observations to investigate the relationship between X-ray sources, optically visible star clusters, and dust-obscured...
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Chen Chen (National Chen Kung University)Poster
The magnitude gap (Δm₁₄), defined as the magnitude difference between the brightest cluster galaxy (BCG) and the fourth brightest galaxy in a cluster, is widely used to probe the formation history of dark matter halos and the dynamical age of galaxy clusters. For example, early-forming clusters are expected to exhibit large magnitude gaps due to galaxy merging.
In this work, we utilize the...
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Wing Ying Eaudrie Wan (National Chengchi University)Poster
To reveal the nature of Type Ia supernovae (SNe Ia), one approach is to identify the surviving companions of their progenitor systems near the explosion centers of the SN remnants (SNRs). In DEM L71, a star was previously reported as a potential surviving companion of the SN Ia because of its peculiar radial velocity, offset by more than 2.5$\sigma$ from the mean of the underlying stellar...
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JieLin Yang (National Central University)Poster
n recent years, citizen science efforts leveraging deep imaging surveys have identified a growing number of planetary nebula (PN) candidates, many of which are large, low-surface-brightness structures potentially representing the most evolved members of the PN population. However, most remain spectroscopically unconfirmed.
We present preliminary results from an ongoing long-slit...
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Ms Sefina Liao (Taichung Municipal Mingdao High)Poster
We have developed a pipeline package (1) to generate simulated and (2) to classify stellar light curves. The simulator considers stellar brightness, period if any, and variation amplitude, and also realistic factors such as noises and observing duty cycles. The second module, the classifier, takes in a light curve, either a simulated one or from an actual observed dataset, to categorize it...
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Mr Chun Hei Chan (Department of Physics, National Cheng Kung University)Poster
Transitional millisecond pulsars (tMSPs) are a rare class of neutron star binaries that switch between accretion-powered and rotation-powered states, providing a unique laboratory to study the interaction between accretion flows and pulsar winds. Multiwavelength observations, particularly in the optical and X-ray bands, have revealed complex variability patterns in these systems, including...
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Yong Tian (National Central University)Poster
We present a unified study of the baryonic Faber–Jackson relation (BFJR) and the fundamental plane (FP) for pressure-supported systems spanning eight orders of magnitude in baryonic mass, from dwarf spheroidals to galaxy groups. Using a homogenized sample of about 1400 systems, we show that both relations depend systematically on the mean internal baryonic acceleration, with a transition...
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Lapo Fanciullo (National Chung Hsing University)Poster
In the study of the interstellar medium, the study of dust thermal emission in the far-infrared is a central tool. Fitting the dust spectral energy distribution (SED) provides key information on interstellar medium column density and temperature. Often, the model used for such fits will be a modified blackbody, i.e. a Planck function at the temperature of the dust, modulated by a dust opacity...
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Dr Zhen-Kai Gao (ASIAA)Poster
CARTA (Cube Analysis and Rendering Tool for Astronomy) is an image visualization and analysis tool designed to meet the demands of the ALMA, VLA, and SKA pathfinders - ASKAP and MeerKAT, and is jointly developed by an international collaboration between ASIAA, IDIA, NRAO, the Department of Physics at the University of Alberta, and AusSRC. The mission of CARTA is to provide usability,...
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Ying Hsuan LiuPoster
CHIMPS2 is the follow-up to the $^{13}\mathrm{CO}$/$\mathrm{C}^{18}\mathrm{O}$(J = 3→ 2) Heterodyne Inner Milky Way Plane Survey (CHIMPS) and the CO High-Resolution Survey(COHRS) and is a Large Program on the JCMT. The CHIMPS2 Inner Galaxy observations cover longitudes between 13° and 47° with $-0.5^\circ \leq b \leq 0.5^\circ$. When combined with the complementary...
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Yu-Ren Lin (ASIAA/NTU)Poster
Galaxy clusters are the largest gravitationally bound structures, residing at the nodes of the cosmic web. They provide key insights into galaxy formation and constrain the growth of structure and underlying cosmology. Across all areas of cluster science, robust cluster finding is fundamental, yet current methods, based on optical, X-ray, and Sunyaev–Zel'dovich (SZ) observations, each exhibit...
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Dr Angelo George (ASIAA, Taipei)Poster
I present findings from our recent study (George et al., 2025, ApJ 987, 45), investigating environmental impacts on the size evolution of massive (log stellar mass > 9.5) quiescent galaxies (QGs). Using CLAUDS+HSC imaging over 18.6 deg², we studied ~86,000 field and ~1,000 cluster-core QGs at redshifts 0.1 to 0.85. We measured effective radii at rest-frame 3000Å (UV) and 5000Å (optical), as UV...
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Mr Chakrapani Reddy (National Chung Hsing University)Poster
The distribution of cosmological baryons remains incompletely understood despite recent progress using fast radio bursts (FRBs). Dispersion measures (DM) trace the integrated ionized baryon content along the line of sight, but uncertainties in the host-galaxy contribution ($\mathrm{DM}_{\rm host}$) limit the statistical significance of correlations between intergalactic DM and large-scale...
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Wen-Miao Kuo (National Changhua University of Education)Poster
Measuring the expansion rate of the Universe, quantified by the Hubble constant (H₀), is an important problem in modern cosmology. In this study, we aim to estimate the Hubble constant by using fast radio bursts (FRBs) detected with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) radio telescope. Current measurements show a significant discrepancy between early-Universe probes, such...
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Xin Tian (National Central University)Poster
We report the comparison of two machine learning clustering algorithms, ML-MOC and HDBSCAN, for determining star cluster membership. ML-MOC employs a combination of the k-Nearest Neighbors (k-NN) algorithm to find candidate members, followed by a Gaussian Mixture Model (GMM) for precise membership probability assignment. This makes it well-suited for regular, centrally concentrated clusters....
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Tzu-Hsuan Lin (National Tsing Hua University)Poster
Pulsars are rapidly rotating, highly magnetized neutron stars that emit periodic pulses of radiation across a broad range of wavelengths, from radio to gamma rays. Despite decades of study, the mechanisms responsible for their radiation remain unclear. In this work, we investigate the correlations between the radio emission of X-ray–emitting pulsars and their X-ray properties. We find that the...
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Rin Yamada (National Astronomical Observatory of Japan)Poster
The Nobeyama 45-m radio telescope, located at an altitude of 1,400 m in Nagano, Japan, has been a world-leading facility for millimeter-wave astronomy since 1982. Its large aperture provides high spatial resolution ($\sim$15$''$ at 110~GHz), while the four-beam FOREST receiver enables efficient wide-area mapping across 86--116 GHz. Several large survey programs have been conducted with this...
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CHUN CHUN LIN (National Changhua University of Education)Poster
This study investigates the quasi-periodic oscillation (QPO) observed in the X-ray emission of the active galactic nucleus (AGN) RE J1034+396. Since QPOs are rare in AGNs and are thought to be closely related to the structure of the accretion disk and its surrounding physical environment, this source provides an important opportunity to explore their physical origin. The main goal of this work...
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Dr Anli Tsai (Taiwan Astronomical Research Alliance (TARA) / National Central University)Poster
The Trans-Pacific Two-Meter Telescope (TP2m) is a collaborative project between NCU, ASIAA, UNAM, SHAO, UNAM, and HNAS. The telescope is expected to be deployed in San Pedro Mártir, Mexico, around 2025. The TP2m will collaborate with the nearby COLIBRI 1.3m. One of the primary goals is to follow up on transient targets identified by the LSST.
We aim to develop the telescope control system...
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Yu-Han HuangPoster
We investigated a population of evolved member stars in NGC 6791, a Galactic open cluster known to be old, with an age rivaling those of Pop II globular clusters but rich in metallicity as Pop I. Using Gaia DR3 proper motion and parallax, we identified member candidates against field stars, from which cluster parameters are derived. We confirm that NGC 6791 has a heliocentric distance of...
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Namitha Kizhuprakkat Ramachandran (National Tsing Hua University)Poster
The assembly history of our Galaxy is encoded in the chemodynamical properties of its stellar populations. In this talk, I will present our work on 88,959 K-giant stars selected from three years of data from the DESI Milky Way Survey (MWS) to characterize our Galaxy’s distant stellar halo. Running HDBSCAN, a density-based clustering algorithm on integrals of motion (Energy, Lz, L⊥) and...
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Dr Ekaterina Koptelova (Graduate Institute of Astronomy, NCU)Poster
We report the discovery of a candidate binary black hole system at redshift z~7.46, identified through high resolution spectroscopy of the Mg II λ2796,2803 doublet. The spectrum reveals a composite Mg II emission profile with two resolved doublets at closely spaced redshifts, z=7.454 and z=7.463. The intrinsically stronger Mg II λ2796 line shows suppression toward a near 1:1 flux ratio,...
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Yu-Chen Chu (National Taiwan University)Poster
The interstellar dust content of a galaxy is closely linked to its star formation. While it is well-established that star-forming galaxies are dust-rich and quiescent galaxies are largely dust-poor, the timeline and drivers of dust depletion immediately following the end of star formation (quenching) remain poorly understood. Understanding this depletion timescale is crucial, as it reveals how...
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Wei-Shan SuPoster
Galactic outflows are thought to be a primary channel for transporting dust grains out of galaxies, especially in dwarf galaxies due to their shallower gravitational potential. However, the existence of CGM dust challenges our understanding of dust evolution, as the conditions in outflows are hostile, where dust grains are expected to be rapidly destroyed by sputtering. We present...
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Xi-Feng Cha (Graduate Institute of astronomy, National Central University)
Maria Family is an old S-type asteroid family named after 170 Maria. Within the evolution, its members have separated with perturbation from 2.55 au distance to the Sun. There are two dynamical effects making them change their original orbits. One is mean-motion resonance (MMR), and the other is non-gravitational force, Yarkovsky effect. In this work we will investigate these two dynamical...
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Mei-Yin Chou (ASIAA)Poster
The Education and Public Outreach (EPO) program at ASIAA continues to strengthen science communication, public engagement, and educational collaboration through measurable outputs in media exposure, multimedia production, publications, and outreach activities. Building upon an established outreach framework, recent efforts have focused on expanding audience reach, enhancing multimedia...
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Yi Duann (Graduate Institute of Astronomy, National Central University, Taoyuan, Taiwan)Poster
The rapid proliferation of low Earth orbit (LEO) satellites and space debris presents increasing challenges to orbital sustainability, collision avoidance, and astronomical observations. As of February 2026, approximately 14,000 active satellites are in orbit, with an additional 1.23 million proposed, highlighting growing concerns over orbital congestion and long-term space environment...
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YaLi Chu (IoA)Poster
The Hubble constant (H₀) characterizes the present-day expansion rate of the universe. However, despite the significant decrease in measurement uncertainties, a discrepancy of more than 4𝜎, known as the Hubble tension, exists between measurements from the Cosmic Microwave Background (CMB), which yields H₀ = 67.66 ± 0.42 km s⁻¹ Mpc⁻¹ under the ΛCDM model, and Cepheid-calibrated Type Ia...
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Majidul Rahaman (IoA, NTHU, Taiwan)Poster
Research workflows are fragmented. Literature lives in Zotero, notes scatter across Notion, ideas disappear into paper notebooks — none of which talk to each other, and all of which require internet, accounts, or subscriptions.
Eukosmos is a single-file, browser-based research notebook that unifies a researcher's entire workflow in one place: literature papers with NASA...
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tzuning YenPoster
Understanding how galaxies evolve over cosmic time is a central goal of modern astrophysics and requires a detailed understanding of the baryon cycle. More than 80% of the baryons associated with galaxies reside in the circumgalactic medium (CGM), making it a key driver of galaxy evolution. Quasar absorption line surveys of distant galaxies show that approximately 20-25% of galaxy halos...
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HAO-MIN Chang (NCU astronomy)Poster
Type Ia supernovae (SNe Ia) are commonly categorized into two sub-groups: normal-velocity (NV) and high-velocity (HV) SNe, which are distinguished by whether the ejecta velocity of Si II λ6355 exceeds 12,000 km s-1 or not. However, the velocity distributions of these two groups overlap, making it difficult to classify them cleanly using ejecta velocity alone. Therefore, in order to identify...
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Yi-Ping Hung (Department of Physics, National Taiwan University)Poster
Double-peaked (DP) emission lines have been revealed via galaxy spectroscopic observations. However, the physical drivers giving rise to the profiles and the underlying galaxy population remain poorly understood. In this poster, I will present our exploration of the DP galaxy properties by utilizing the largest spectroscopic dataset provided by the Dark Energy Spectroscopic Instrument (DESI)....
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YANG YI JHENPoster
This research project aims to compare the mass function of giant molecular clouds (GMCs) with the luminosity function of the H II region to better understand the relationship between the mass distribution of GMC and the luminosity distribution of the H II region. We use the PHANGS-MUSE instrument to obtain luminosity data for the H II region and the PHANGS-ALMA instrument to obtain mass data...
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Mr Pei-Cheng Tung (ASIAA)Poster
We present the first simulation of the formation and evolution of a supernova remnant (SNR) in a realistic interstellar environment drawn directly from a galactic simulation. Our study employs magneto-hydrodynamical simulations with the GIZMO code, including detailed interstellar medium (ISM) physics. Unlike previous studies that assume idealized environments, our pre-explosion conditions are...
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佳蓁 余Poster
In this work, we measure and model the galaxy number density radial profiles of eFEDS clusters using HSC-SSP galaxies. The eFEDS clusters have redshift $< 1.31$ and virial masses $\mathrm{∼10^{14} M_\odot/h}$. We divide the cluster sample into 26 subsamples based on redshift and virial mass.
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For each subsample, we observe the mean galaxy number density radial profile within a radius of 3... -
Angelo George (ASIAA, Taipei)Poster
I investigate spatially resolved star formation and gas properties in KILOGAS galaxies using ALMA and optical IFU data, as part of my ongoing work at ASIAA, through radial profiles of specific star formation rate (sSFR), gas fraction ($f_g$), and star formation efficiency (SFE). Galaxies are divided into star-forming, green valley, and quiescent populations to probe evolutionary pathways. I...
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te chun wang (retired teacher)Poster
A field flux picture with generalized Integral Gauss’s law of gravity is proposed for an alternative solution for mass discrepancy problem of disk galaxies. The flat rotation curve of disk galaxies is modeled by a cylindrical distribution of the gravitational field flux along the disk surface and the radius dependence of the field strength becomes 1/r, instead of Newtonian 1/r^2.
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Below a... -
Ya-I Chen (National Yang Ming Chiao Tung University)Poster
In this study, we investigate the gravitational lensing effects of projected elliptical halos. We perform a comparative analysis of the Cored Steep Ellipsoid (CSE) model, the standard spherical NFW model, and the elliptical NFW model to assess their relative performance and accuracy.
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Within the CSE framework, we conduct a quadrupole shear analysis and further extend it to include higher order... -
Bahareh Soleimanpour Salmasi (National Tsing Hua University)Poster
Brown dwarfs are faint objects that fall between stars and planets in mass, making them intrinsically difficult to detect and confirm. In deep extragalactic survey fields, this becomes even more challenging, since brown dwarf candidates can easily be confused with distant galaxies or other faint sources. In this project, I study a sample of brown dwarf candidates in the COSMOS field using...
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tzuan kuo (國立臺灣大學數學系)Poster
Convective Overstability (COS) is a hydrodynamic instability in protoplanetary discs (PPDs) that is thought to form large-scale structures like zonal flows (or pressure bumps) and vortices. These structures are supposed to trap dust grains, potentially accelerating planetesimal formation. However, current numerical models rely heavily on periodic vertical boundary conditions (VBCs). Because...
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Vianey Camacho (National Taiwan Normal University)Poster
Elongated infalling structures, known as streamers, are increasingly observed around young stellar objects (YSOs), suggesting anisotropic accretion onto protoplanetary disks. These features may influence disk evolution by inducing shocks, transporting chemically distinct material, and triggering accretion variability, yet their physical origin remains uncertain. We explore a new mechanism for...
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Hao-Min ChangPoster
Scheduled for launch in Q4 2026, the Gamma-ray Transients Monitor (GTM) is a science payload aboard the Taiwanese satellite Formosat-8B. Designed to detect GRBs and other gamma-ray transients within the 50 keV to 2 MeV energy band, the instrument consists of two detector units equipped with GAGG(Ce) scintillators and SiPMs to provide all-sky coverage. With an expected detection rate of 50 GRBs...
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Ting-Kai Yang (NTU/ASIAA)Poster
Submillimeter galaxies (SMGs) are characterized by high star formation rates (SFRs) and strong luminosities in the far-infrared and submillimeter regimes. They represent a key population in galaxy evolution, exhibiting extreme star-forming activity and large stellar masses. Near-infrared spectroscopy is particularly effective for characterizing SMGs, especially at cosmic noon (z ∼ 2) and...
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Hong-Wen Liu (National Tsing Hua University)Poster
We investigate the transformation of cool-core (CC) clusters into non-cool-core (NCC) systems during cluster mergers, incorporating both active galactic nucleus (AGN) feedback and radiative cooling. Using three-dimensional hydrodynamic simulations implemented with the GAMER (v2) code, we explore how mergers affect the entropy evolution of CC clusters. By varying key parameters such as mass...
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Chen-Yen Hsu (IANCU)
Our Moon possesses a tenuous, collisionless "atmosphere", known as an "exosphere". In 1988, sodium was detected in the lunar exosphere through ground-based spectroscopic observations (Potter & Morgan, 1988). Due to solar radiation pressure acceleration, the sodium exosphere extends into a tail. When viewed in an Earth-centered coordinate frame, it exhibits a projected sodium spot with an...
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Po-CHih Chang (National Central University)
Jupiter Trojans are a population of co-orbital asteroids that share Jupiter’s orbit around the Sun. Owing
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to their long-term dynamical stability, they are thought to preserve primordial material and thus provide key
constraints on early Solar System evolution and planetary migration models. In this study, we combine high
cadence observations from the Zwicky Transient Facility (ZTF)... -
Srivardini Ayyappan (NTHU, Macquarie University)Poster
It is important to find and study protoclusters in the distant Universe during their formative stages in order to understand the formation and evolution of present-day galaxy clusters. In the pre-JWST era, protocluster candidates were primarily identified up to z ≲ 7, limited by optical wavelength coverage and survey area. Deep JWST near-infrared surveys such as CEERS and JADES have enabled...
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13. Low and Constant Star Formation Efficiencies in the Gravitational Hierarchical Collapse ScenarioVianey Camacho (National Taiwan Normal University)Poster
We investigate the Schmidt–Kennicutt relation and the star formation efficiency per free-fall time ($\epsilon_{\mathrm{ff}}$) in simulations of filamentary molecular clouds undergoing gravitational collapse. We study early evolutionary stages, with global star formation efficiencies of $\sim 2-10 \%$, using surface-density ($\Sigma$) maps like observational studies. Our simulations reproduce...
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Tsz Hei Chan (NTHU)Poster
Accurate distance measurements are fundamental to understanding the formation and distribution of galaxies in the nearby universe. For faint and diffuse systems, such as dwarf and low-surface-brightness (LSB) galaxies, distances are needed to distinguish satellites from background systems, to derive physical properties such as mass and size, and to map the structure of the local volume (LV)....
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Ms Wing Yu Siu (ASIAA)Poster
We present radiative transfer modeling of the 1.3 mm dust-continuum emission in the Class 0 protostar IRAS 04166+2706, observed as part of the ALMA Large Program ``Early Planet Formation in Embedded Disks (eDisk).'' Using the radiative transfer code RADMC-3D, we construct disk models characterized by an exponential-taper surface density profile, which describes the radial distribution of dust...
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Dr Lapo Fanciullo (Tamkang University)Poster
Star formation is a fundamental process driving galaxy evolution. To understand how galaxies grow and transform, it is essential to study systems spanning a wide range of star formation activity. Moreover, since stars form from molecular gas, the properties of molecular gas also play an essential role in regulating galaxy evolution.
In this work, we compile molecular gas measurements traced...
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Ting-Chen Chen (NTHU IoA)Poster
Protostellar outflows play an important role in the early stages of star formation by regulating angular momentum. We targeted the molecular outflow of an isolated source, CB68, which hosts the Class 0 protostar IRAS16544-1604. By combining ALMA and ACA observations, we identified a bipolar molecular outflow with an extent ranging from ~9,000 to 15,000 au. The CO(2-1) and $^{13}$CO (2-1)...
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余 承諳 (國立彰化師範大學物理學系光電組四年級)Poster
In this study, we present a comprehensive catalog of short bursts from magnetars based on thirteen years of NuSTAR observations. We compiled all short bursts from observed magnetars to analyze their durations, spectral properties, and the relationships between these characteristics across different sources. In the duration distribution, we clearly observed that bursts from SGR J1935+2154 are...
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Chung-Ming KoPoster
Cosmic rays interact with magnetized plasma via scattering with the magnetic fluctuations or waves embedded in the plasma. As they stream through the plasma they excite Alfven waves. This forms a self-consistent system. The structure and evolution of the system can be studied by treating the system as a multi-fluid system. We are interested in the three-fluid system which comprises thermal...
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Po-Han Chen (ASIAA)Poster
The Transiting Exoplanet Survey Satellite (TESS), a space-based optical observatory, was primarily designed to monitor stellar light curves and detect exoplanets. However, its Full-Frame Images (FFIs) are also highly valuable for both galactic and extragalactic science, particularly in the low surface brightness (LSB) regime (Holwerda, 2018). We constructed a full-sky map from TESS image...
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Yizhi HongPoster
The accreting millisecond X-ray pulsar (AMXP) IGR J17062–6143 was discovered in 2006 by INTEGRAL, with subsequent RXTE observations detecting a pulsation frequency of 163.65 Hz. To further characterize its long-term timing behavior, NICER conducted an extensive monitoring campaign comprising several observations between 2017 and 2022. This study focuses specifically on the analysis of...
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Chia-Tse Wang (Graduate Institute of Astrophysics, National Taiwan University)Poster
We investigate the spatially resolved star formation histories (SFHs) of seven post-starburst (PSB) galaxies at $z \approx 0.6$--$1.0$ using multi-band imaging from the JWST/PRIMER--COSMOS and HST/CANDELS surveys. Combining rest-frame UV--to--near-IR coverage ($0.4$--$4.4~\mu$m), we perform pixel-by-pixel SED fitting to reconstruct the radial SFHs of individual galaxies. We first apply a...
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Hsi-An Pan (Tamkang University)Poster
Galaxy interactions and mergers are expected to redistribute baryons across galactic disks, yet how molecular gas and metals are reorganized as a function of merger stage remains poorly constrained. In this work, we investigate the radial structure of molecular gas and gas-phase metallicity using a large sample of nearby galaxies from the KILOGAS survey spanning a wide range of interaction...
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Yin-Jhen Huang (Department of Physics, National Taiwan University)Poster
Radiative turbulent mixing layers are central to the evolution of interstellar and circumgalactic gas, characterized by rapid radiative cooling at intermediate temperatures. While recent studies have focused extensively on cooling driven by the Kelvin-Helmholtz (KH) instability, the role of the Rayleigh-Taylor (RT) instability, a key mechanism in supernova remnants, remains largely...
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Chih-En Wu (IoA, NTHU)Poster
The Gamma-ray Transients Monitor (GTM) is a secondary payload on board Formosat-8B (FS-8B), scheduled for launch in 2026. It aims to monitor Gamma-ray Bursts (GRBs) and other bright gamma-ray transients in the energy range from 50 keV to 2 MeV. GTM consists of two units, each containing four sensor modules, mounted on opposite sides of FS-8B. With each unit covering one celestial hemisphere,...
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Mx Maho Pan (National Tsing Hua University)Poster
Every morning, the astro-ph deluge arrives. Hundreds of papers. Keyword
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searches miss the context. Manual BibTeX management is a pain. We need
a smarter way to read and cite. -
Mr Terry Long Phan (Institute of Astronomy, National Tsing Hua University)
The outer solar system is theoretically predicted to harbor an undiscovered planet, often referred to as Planet Nine (P9). Simulations suggest that its gravitational influence could explain the unusual clustering of distant Kuiper Belt Objects. However, no observational evidence for P9 has been found so far, as its predicted orbit lies far beyond Neptune, where it reflects only a faint amount...
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Tien-Hao Hsieh (Taiwan Astronomical Research Alliance (TARA))Poster
We employ machine learning methods to analyze ALMA archive data within the Interstellar Medium and Star Formation categories. To manage the massive data volume, we utilize DBSCAN to extract subcubes including signal detections from the archive datacubes. As a result, we reduced the data size to approximately 5% of its original volume, comprising a total of ~250,000 FITS cubes. We aim to...
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Dr Che-Jui Chang (National Taiwan University)Poster
A jet bursting from a high-mass microquasar (HMMQ) behaves just as its scaled-down counterpart bursting from an active galactic nucleus. The jet–wind interaction is conjectured to affect the γ-ray emission. A jet in a HMMQ evolves much faster than its counterpart in an AGN, making the former valuable in studying accretion, eruption, and emission processes around a black hole. In this work, the...
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Khoa Ngo Thanh Ho (National Central University)Poster
We present photometric and spectroscopic observations of the Type Ic superluminous supernova SN2025imr at redshift z ≈ 0.09, distinguished by a pronounced post-peak stair-like decline in its light curve, in which the luminosity decreases in discrete steps rather than following a smooth decay, with the brightest epoch is detected at an absolute magnitude of approximately −22 mag. The dataset...
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Chuan-Jui Li (NCCU)Poster
The nature of supernova (SN) explosions can be unveiled by the geometry of their remnants. We develop a systematic machine-learning–based framework to analyze the geometric structures of supernova remnants (SNRs). By applying Gaussian Mixture Model (GMM) fitting to the observed brightness distributions, we decompose both the shock fronts and interior materials into multiple Gaussian...
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Ian-Lin Lai (NCU)
The lunar exosphere, first identified during the Apollo missions, is a tenuous, collisionless surface-bounded environment composed of species with distinct origins and transport behaviors. Helium is primarily supplied by solar wind implantation, whereas sodium is mainly released from the lunar surface through sputtering and photon-stimulated desorption. Because intermolecular collisions are...
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Dipak Debnath (National Tsing Hua University)Poster
GS 1354-64 is a transient black hole X-ray binary that has been studied during its past outbursts, which primarily exhibited hard-state behavior. In this work, we present a detailed broadband spectral analysis of its 2025-2026 outburst using data from Insight-HXMT and NuSTAR, providing wide energy coverage from soft to hard X-rays.
The spectra are modeled using diskbb+powerlaw,...
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SUBHAM SRIMANI (National Tsing Hua University)Poster
The Galactic transient X-ray binary GRS J1739–278 was simultaneously monitored by the IXPE, NuSTAR, Swift and Insight-HXMT satellites during its recent 'failed' outburst in 2025. We have performed a broadband spectral evolution study of the source using Swift XRT, IXPE and NuSTAR data in the 1–50 keV band with different sets of phenomenological and physical models. The spectral fitting shows...
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Chung-Wen Wang (National Tsing Hua University)Poster
We present a new framework for constructing stellar halo density profiles from galaxy merger histories without relying on particle-based simulations. An approximate but efficient approach allows us to capture the essential physics of tidal stripping and orbit evolution for large ensembles of stellar halo models, making it well suited for statistical studies of halo structure and assembly. We...
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HaoMin Wu (National Taitung University)Poster
Fast Radio Bursts (FRBs) often exhibit a downward frequency drift, known as the sad-trombone effect, even after removing dispersion. The physical origin of this phenomenon remains unclear and may arise from either intrinsic emission processes or propagation effects. In this work, we apply a plasma lensing model to investigate whether frequency-dependent propagation can account for the observed...
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Hiu Yeung Cheng (Department of Physics, The Chinese University of Hong Kong)Poster
The cosmological principle asserts that the Universe is statistically isotropic on large scales, while alternative cosmological models can produce anisotropic signatures. Recent studies have suggested tantalising hints of anisotropies in supernova Ia, cosmic microwave background, and gamma-ray burst data, though these remain unconfirmed. We test for cosmological anisotropies using the latest...
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Chuan-Jui Li (NCCU)Poster
We present a scalar‐field formulation of the generalized Chaplygin gas (GCG) and modified Chaplygin gas (MCG) models, in which the cosmic fluid dynamics are reproduced by canonical Lagrangians with analytically derived energy density $\rho(\phi)$, pressure $p(\phi)$, and scalar potential $V(\phi)$. This framework provides a unified description of dark matter and dark energy, transitioning...
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Tz-En Gau (National Taiwan University)Poster
The CO-to-H$_2$ conversion factor $X_\text{CO}$ is commonly used to estimate the mass of molecular clouds in the interstellar medium (ISM), yet its applicability in galactic outflow remains poorly constrained. Starburst and AGN-host galaxies commonly exhibit high-velocity ($\gtrsim 100\ \mathrm{km\ s^{-1}}$) CO-emitting outflows. In these extreme environments, the density, temperature, and...
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Gutu Dereje Mekonen (National Tsing Hua University)Poster
We present a study of the relationship between large-scale environment and AGN activity across 0.5 ≤ z ≤ 5.0 in the GOODS-S field. This work combines two complementary JWST datasets in a two-layer approach: JADES DR5 serves as the environmental backbone, providing an exceptionally deep and wide photometric catalogue in the GOODS-S field from which local projected surface densities are...
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Hsiang-Yu Chen (National Central University)Poster
While the Chamaeleon cloud complex harbors hundreds of newly born stars, the adjacent Musca filament is considered to be at a quiescent stage of star formation. To assess whether Musca is prestellar or already forming stars, we studied a $\sim0.5^\circ \times 2^\circ$ region along the filament using near- to mid-infrared data from 2MASS and AllWISE. Here we report more than a dozen embedded...
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Yu Shan ChengPoster
We present a measurement of the redshift enhancement of background galaxies behind clusters. The 3,085 cluster sample is selected from RASS-MCMF with a redshift range of $0.05\leq z<0.4$. The background galaxies are obtained from DESI, including LRGs with redshifts 0.4-1.1 and ELGs with redshifts 0.8-1.6.
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The RASS-MCMF clusters are selected within a 10 Mpc of the DESI area. We center on each... -
WENCHUN LU
The passage of the Kreutz-family comey C/2026 A1 MAPS at a distance of less than 0.2 solar radii from the Sun on April 4 has drawn a lot of attention to its possible fate. That is, whether it will survive the perihelion passage like comet Ikeya-Seki in 1965 or it will be broken up into many fragments like the case of comet ISON in 2013 will be closely watched. We would like to take this...
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You-Hao Chen
Europa, harboring a vast global ocean beneath its icy crust, is considered one of the most promising targets in the solar system for astrobiological exploration and habitability assessment. Understanding its surface chemical evolution and mass loss is crucial for deciphering the composition of the hidden ocean.
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Europa is located within the magnetosphere of Jupiter. The electrons and heavy... -
Po-Yen HuangPoster
In typical star forming galaxies, cooling is dominated by fine-structure metal lines where H₂ formation occurs predominantly via the dust channel. However, in dwarf galaxies with extremely low metallicity, cooling and chemistry behave qualitatively differently. In this study, we perform high-resolution hydrodynamic simulations using the GIZMO code to investigate the thermal balance of the...
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Afif Ismail (National Taiwan Normal University)Poster
The observation of the M87* black hole shadow has opened new avenues for exploring horizon-scale phenomena around astrophysical black holes. Current black hole image modeling often relies on one-fluid general relativistic magnetohydrodynamic (GRMHD) simulations to model the black hole system, with subsequent post-processing with radiative transfer based on the simulated environments. However,...
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Peng-Yin Wang (National Central University)Poster
Super-Chandrasekhar (03fg-like) Type Ia supernovae remain among least understood subclasses of thermonuclear explosions, their high luminosity have been attributed to various scenarios, including rotating massive WDs and interaction with circum-stellar medium (CSM). While 03fg-like SNe exhibit similar photometric evolution as those normal SNe Ia, they show a significantly more rapid decline...
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Zane Nikia Domingo (Graduate Institute of Astronomy, National Central University, Taiwan)Poster
Wolf-359 is an M6.5 dwarf, famous for being an active flare star located in our solar neighborhood at a distance of approximately 2.42 pc. Due to its proximity, it has been a primary target for stellar activity surveys including the EDEN project (Lin et al., 2021). Their combined observations from Kepler/K2 and EDEN showed that the flare frequency is a function of the flare energy. Flares...
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Dr Angelo George (ASIAA, Taipei)Poster
Understanding how bulges and disks grow across cosmic time is key to uncovering the physical processes that shape galaxy evolution. We investigate the wavelength-dependent structural evolution of galaxies using a mass-complete sample of 44,000 star-forming galaxies (SFGs) and 34,000 quiescent galaxies (QGs) at z<0.85. By modelling bulges and disks separately in rest-frame UV (3000 Å) and...
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LEE YI-SIANPoster
Uniform detector response is essential for reliable crystal evaluation
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and selection in scintillation-based detection systems. In this study,
the response of a multi-channel SiPM array was equalized using a
reference GAGG crystal, with a LYSO source generating a stable energy
peak signal for calibration. By aligning the energy peak response across
all channels, a consistent detector... -
Mr HAO-WEN ZHENG (National Yang Ming Chiao Tung University)Poster
We present a joint strong and weak lensing analysis of Abell 370 using Hubble Space Telescope imaging from the BUFFALO survey and wide-field observations from Subaru/Suprime-Cam. By combining deep, high-resolution data with wide-field coverage, we reconstruct the mass distribution of the cluster from its core to the outskirts.
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Using Lenstool, we adopt a hybrid approach that incorporates fixed... -
Ms Rui-Zhen Wang (國立中山大學附屬國光中學)
本報告嘗試盡可能定量地討論角動量在月球起源模型中存在的問題
目前的主流理論巨大撞擊說（Giant Impact Hypothesis）（地球與忒伊亞相撞）
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雖然大致成功, 人為假設外來的一次「斜向撞擊」注入適量角動量,撞擊後拋出的物質形成盤, 凝聚成月球產生地球自轉月球公轉兩者方向一致,電腦模擬可以重現接近現今的角動量數值符合觀測
而同源形成說（Co-formation）（地球與月球一起從原始盤形成）從角動量的定量估算, 探討地球與月球繞太陽運行彼此之間的角動量耦合強度,是否有辦法解釋月球目前的軌道距離及地月之間的角動量如何分配,
本報告主要希望透過回顧角動量的基本定義,嘗試探討是否有可能的基本物理演化機制來形成現在的結構及觀測到的角動量配置, 而不需要一隻外來的魔手的幫助。 -
CHUNG-EN LEE (臺南市南瀛天文館)
本研究介紹兩起小行星掩星觀測案例，說明掩星觀測在業餘天文研究中的潛力。小行星(508) Princetonia的掩星事件，觀測資料顯示短暫的第二次減光，暗示該小行星可能存在尚未確認的衛星。小行星(15848) 1995 YJ4的掩星事件，其光變曲線亮度下降幅度低於預期，結合恆星的天文測量資料，推測被掩星HIP 77025可能為一個尚未確認的雙星系統。
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