Invited Presentation

Constraining dust mass and grain sizes in young stellar objects based on (sub)millimeter extinction curves

Author(s): Hauyu Baobab Liu

Presenter: Hauyu Baobab Liu (ASIAA)

I will review the exploration of the (sub)millimeter extinction technique in the studies of young stellar objects (YSOs) since 2016. We concluded that the protostellar envelopes rapidly collapse and pile-up at the relatively inviscid disk(-like) structures where no signature of grain growth to larger than 100 micron sizes was confirmed. At the later stages when the disks are no more embedded, the detection of the anomalously low (sub)millimeter spectral indices indicated that the maximum grain sizes may be 10-100 micron in general. Our conclusions have large discrepancy from those which were made out of the conventional approaches. I will propose a few possibilities to testify either cases.