Speaker
Description
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 measure the dynamical masses of the protostars and to investigate their relationship with disk properties.
Among the 25 sources, 19 were newly observed with ALMA in Cycles 10 and 11 in Band 6, obtaining 1.3 mm continuum emission as well as several molecular lines, including CO isotopologues such as C$^{18}$O (2–1). For the remaining six sources, comparable datasets were retrieved from the ALMA archive. The typical angular resolution of the observations is ∼0.14″–0.17″, with sensitivities of ∼30 μJy beam$^{-1}$ for the continuum and ∼2–4 mJy beam$^{-1}$ per channel for the molecular lines.
The 1.3 mm continuum emission is clearly detected toward all 25 protostars, revealing a wide diversity in source sizes spanning approximately one order of magnitude; in several cases, the emission is not fully spatially resolved. A subset of the sources are identified as binary systems. Compact C$^{18}$O emission associated with the continuum emission is detected in a fraction of the sample, while compact $^{12}$CO (2–1) emission associated with the continuum emission is detected toward all sources except one. These compact emissions are considered to trace either envelopes or disks associated with the protostars.
In this presentation, I will provide an overview of the eDisk@Oph project and report on the current status and recent progress of the data reduction and initial analysis with particular emphasis on the velocity structures of the molecular emission.
| Participate the oral/poster presentation award competition | No |
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