演講資訊

摘要：

With unprecedented resolution and sensitivity of Atacama Large Millimeter/submillimeter Array (ALMA), tens of protoplanetary disks are found to have fine structures, such as rings and gaps. The protoplanetary disk around HL Tau is one of the youngest disks showing the fine structures, and it is considered as a promising candidate site of planet formation. Over the past five years, we had follow-up studies of HL Tau with IRAM 30m, JCMT, SMA, and ALMA. In this presentation, I will introduce gas kinematics from 0.1 pc to 10 au scales around HL Tau revealed by our observations. On the large scale, we find signs of outflow feedback from a nearby star on the ambient gas around HL Tau, which could affect the mass accretion in HL Tau. On the small scale, we find a gas stream flowing onto the protoplanetary disk around HL Tau as well as a gas gap in the disk. I will discuss the gaseous disk structures and the gas stream in HL Tau in the context of planet formation and the implication of the outflow feedback in HL Tau on the star formation process.