Poster Presentation
Probing the Physical Conditions of Protostellar Disks through Multi-band Observations and Modeling
Presenter: Kazuya Saigo (ASIAA)
Recent observations suggest that planet formation may already be underway during the protostellar disk stage, making it important to understand the internal structure and physical conditions of protostellar disks. However, the heating mechanisms and dust evolution processes operating within these disks remain poorly understood. As a first step, we performed radiative transfer modeling with RADMC-3D for the eDisk target, the Class I protostar IRS7Ba, and showed that its protostellar disk has a flared structure and that viscous heating is required to reproduce the observed intensity profile (Takakuwa, Saigo et al. 2024). Here, I present the results obtained by extending this pioneering study to multi-band modeling based on EVLA and ALMA observations of the Class 0 protostar GSS30 IRS1, the Class I protostar IRS7Ba, and TMC1-A. Our results suggest that the heating mechanism in protostellar disks is consistent with layered accretion in at least some sources, and that a population of relatively small dust grains is present beyond the previously observed extent of the dust disk inferred from higher-frequency observations. These results provide new constraints on the thermal structure and dust evolution of protostellar disks.
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