Oral Presentation

ALMA Study of Misalignments between Protostellar Envelopes and Disks

Author(s): Shigehisa Takakuwa, Hideaki Yamada (Kagoshima University), Kazuya Saigo (NAOJ) et al.

Presenter: Shigehisa Takakuwa (Kagoshima University)

We will present observational evidence for misalignments between protostellar disks and envelopes, which should be an interesting by-product from our approved ALMA Large Program, "eDisk". With ALMA observations of the Class I protostar L1551 IRS 5, we found that the C18O 3-2 velocity channel maps are better reproduced with the r~70 au Keplerian disk and the r~1000 au infalling and rotating envelope, which is misaligned from the disk by ~20 deg. In another Class I protostar IRAS 04169+2702, our previous SMA observations show a hint of counterrotation between the r~100 au scale Keplerian disk and the outer r~1000 au scale protostellar envelope. The follow-up ALMA observations of IRAS 04169 are now ongoing. Such a misalignment between the protostellar disk and envelope should be an important indicator of the effect of magnetic field and turbulence in the course of disk formation.