Poster Presentation

ALMA Observations of the Class I Protostar L1489 IRS: Warped Disk Structure

Author(s): J. Sai (U Tokyo/NAOJ), N. Ohashi(NAOJ/ASIAA), K. Saigo (NAOJ), T. Matsumoto (Hosei Univ.), Y. Aso (ASIAA), S. Takakuwa (Kagoshima Univ./ASIAA), M. Saito (NAOJ), Y. Aikawa, H.-W. Yen, I. Kurose, K. Tomisaka, K. Tomoda, M. Machida

Presenter: Jinshi Sai (University of Tokyo/NAOJ)

Formation process of protoplanetary disks is still unclear even though disks play key roles in star and planet formation. To understand how disks form, it is essential to reveal detailed disk structures around protostars during the disk formation phase. We have observed the Class I protostar L1489 IRS (d=140 pc) with ALMA at a high angular resolution of 0.3’’ in Band 6 (230 GHz). Our observations in the C18O J=2-1 line have revealed that the Keplerian disk extended up to r~600 au with gaps at r~150-300 au. In addition, the disk plane changes its position angle at the gaps by ~15 degree. Comparing these observed features with kinematic models, it is found that the disk around L1489 IRS can be well explain as a warped disk. Theoretical simulation suggests that such a warped disk structure could be formed by accretion from an envelope misaligned with the disk.