Oral Presentation

Analytical Estimation of Prototellar Mass using the eDisk Sample

Author(s): Yusuke Aso (KASI), Jinshi Sai (ASIAA), and eDisk team

Presenter: Yusuke Aso (KASI)

The stellar mass is a basic parameter that enables us to discuss protostellar evolution by comparison with the quantities expected to be measured more actively in the Band 1 and WSU era, such as disk size, grain size, and chemical compositions. As one of the systematic studies of the ALMA large program eDisk, we have applied four analytical methods to the eDisk sample to estimate the stellar mass. The first method uses the intensity-weighted 2D mean positions, which are expected to be aligned in the major axis of the disk in the case of Keplerian rotation. The second method fits a power-law function to the edge and ridge points of a position-velocity (PV) diagram along the major axis. The third method fits the PV diagrams along the major and minor axes together with a disk+envelope model. The last method fits channel maps with a multi-layered Keplerian disk model. Applying these multiple methods allows us to estimate the mass more robustly. In addition, the difference among the methods provides a realistic uncertainty for the estimation, which is 10-30% for most of the eDisk targets.