Low-Mass Star Formation: From Molecular Cloud Cores to Protostars and Protoplanetary Disks

S. I. Inutsuka, Masahiro Machida, T. Matsumoto, Y. Tsukamoto, K. Iwasaki

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

This review describes realistic evolution of magnetic field and rotation of the protostars, dynamics of outflows and jets, and the formation and evolution of protoplanetary disks. Recent advances in the protostellar collapse simulations cover a huge dynamic range from molecular cloud core density to stellar density in a self-consistent manner and account for all the non-ideal magnetohydrodynamical effects, such as Ohmic resistivity, ambipolar diffusion, and Hall current. We explain the emergence of the first core, i.e., the quasi-hydrostatic object that consists of molecular gas, and the second core, i.e., the protostar. Ohmic dissipation largely removes the magnetic flux from the center of a collapsing cloud core. A fast well-collimated bipolar jet along the rotation axis of the protostar is driven after the magnetic field is re-coupled with warm gas (∼103 K) around the protostar. The circumstellar disk is born in the "dead zone", a region that is de-coupled from the magnetic field, and the outer radius of the disk increases with that of the dead zone during the early accretion phase. The rapid increase of the disk size occurs after the depletion of the envelope of molecular cloud core. The effect of Hall current may create two distinct populations of protoplanetary disks.

本文言語英語
ホスト出版物のタイトルConditions and Impact of Star Formation 2015
編集者R. Schaaf, Jurgen Stutzki, Robert Simon
出版社EDP Sciences
ページ219-226
ページ数8
ISBN(電子版)9782759820221
DOI
出版ステータス出版済み - 5 20 2016
イベント6th Zermatt Symposium on Conditions and Impact of Star Formation: From Lab to Space 2015 - Zermatt, スイス
継続期間: 9 7 20159 11 2015

出版物シリーズ

名前EAS Publications Series
75-76
ISSN(印刷版)1633-4760
ISSN(電子版)1638-1963

その他

その他6th Zermatt Symposium on Conditions and Impact of Star Formation: From Lab to Space 2015
Countryスイス
CityZermatt
Period9/7/159/11/15

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Engineering(all)
  • Space and Planetary Science

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