Disk Structure around the Class i Protostar L1489 IRS Revealed by ALMA: A Warped-disk System

Jinshi Sai, Nagayoshi Ohashi, Kazuya Saigo, Tomoaki Matsumoto, Yusuke Aso, Shigehisa Takakuwa, Yuri Aikawa, Ippei Kurose, Hsi Wei Yen, Kohji Tomisaka, Kengo Tomida, Masahiro N. MacHida

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We have observed the Class I protostar L1489 IRS with the Atacama Millimeter/submillimeter Array (ALMA) in Band 6. The C18O J = 2-1 line emission shows flattened and non-axisymmetric structures in the same direction as its velocity gradient due to rotation. We discovered that the C18O emission shows dips at a radius of ∼200-300 au while the 1.3 mm continuum emission extends smoothly up to r ∼ 400 au. At the radius of the C18O dips, the rotational axis of the outer portion appears to be tilted by ∼15° from that of the inner component. Both the inner and outer components with respect to the C18O dips exhibit the r -0.5 Keplerian rotation profiles until r ∼ 600 au. These results not only indicate that a Keplerian disk extends up to ∼600 au but also that the disk is warped. We constructed a three-dimensional warped-disk model rotating at the Keplerian velocity, and demonstrated that the warped-disk model reproduces main observed features in the velocity channel maps and the PV diagrams. Such a warped-disk system can form by mass accretion from a misaligned envelope. We also discuss a possible disk evolution scenario based on comparisons of disk radii and masses between Class I and Class II sources.

元の言語英語
記事番号51
ジャーナルAstrophysical Journal
893
発行部数1
DOI
出版物ステータス出版済み - 4 10 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Sai, J., Ohashi, N., Saigo, K., Matsumoto, T., Aso, Y., Takakuwa, S., Aikawa, Y., Kurose, I., Yen, H. W., Tomisaka, K., Tomida, K., & MacHida, M. N. (2020). Disk Structure around the Class i Protostar L1489 IRS Revealed by ALMA: A Warped-disk System. Astrophysical Journal, 893(1), [51]. https://doi.org/10.3847/1538-4357/ab8065