Speaker
Description
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 ~23 days, with a slow rise of ~77 days to a peak absolute magnitude of r ≈ −21.4 mag. We interpret SN 2024ahr as an extremely energetic core-collapse supernova powered primarily by a magnetar central engine. The pre-peak bump is modeled using a magnetar-driven shock breakout framework with TransFit, while the overall light curve modeling with MOSFiT magnetar model yields a spin period P_spin = 0.95 ms, magnetic field B = 2.5 × 10^14 G, and ejecta mass M_ej = 64.29 M☉. Early-time spectra display the characteristic W-shaped O II absorption feature, which fades near maximum light, while late-time spectra (+268 and +450 days) are dominated by nebular emission lines and host-galaxy features. Spectral modeling with SYN++ identifies the dominant absorption features across epochs, providing a consistent description of the spectroscopic evolution. Overall, SN 2024ahr represents an extreme magnetar-powered Type Ic superluminous supernova with a large nickel yield.
| Participate the oral/poster presentation award competition | Yes |
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