Oral Presentation

Observational Studies of Disk Formation around Low-mass Protostars

Hsi-Wei Yen (ASIAA) et al.

Circumstellar disks around young stellar objects are sites of planet formation. How and when these disks form during star formation processes and the role of magnetic field in disk formation are still unclear. In this presentation, I will introduce our single-dish, SMA, and ALMA observational results of a sample of protostellar sources. We analyze their gas kinematics and find a possible evolutionary sequence from slowly-rotating and infalling protostellar envelopes to large-scale Keplerian disks. With the ALMA observations, we further resolve the transition from infalling motion to Keplerian rotation, the forming process of disks, in three sources. These results will be discussed in comparison with observational results of magnetic field orientation and theoretical models of collapsing dense cores with and without magnetic field.