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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationConditions and Impact of Star Formation 2015
EditorsR. Schaaf, Jurgen Stutzki, Robert Simon
PublisherEDP Sciences
Pages219-226
Number of pages8
ISBN (Electronic)9782759820221
DOIs
Publication statusPublished - May 20 2016
Event6th Zermatt Symposium on Conditions and Impact of Star Formation: From Lab to Space 2015 - Zermatt, Switzerland
Duration: Sep 7 2015Sep 11 2015

Publication series

NameEAS Publications Series
Volume75-76
ISSN (Print)1633-4760
ISSN (Electronic)1638-1963

Other

Other6th Zermatt Symposium on Conditions and Impact of Star Formation: From Lab to Space 2015
CountrySwitzerland
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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  • Cite this

    Inutsuka, S. I., Machida, M., Matsumoto, T., Tsukamoto, Y., & Iwasaki, K. (2016). Low-Mass Star Formation: From Molecular Cloud Cores to Protostars and Protoplanetary Disks. In R. Schaaf, J. Stutzki, & R. Simon (Eds.), Conditions and Impact of Star Formation 2015 (pp. 219-226). (EAS Publications Series; Vol. 75-76). EDP Sciences. https://doi.org/10.1051/eas/1575045