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  1. B100 理学部/理学研究科
  2. B100a 雑誌掲載論文
  3. 学術雑誌

Constraints on the formation of brown dwarfs by turbulent compression

http://hdl.handle.net/2237/00031026
http://hdl.handle.net/2237/00031026
1c88ab89-a8be-493c-99db-1ebaa9be6cac
名前 / ファイル ライセンス アクション
stz1892.pdf stz1892 (318.4 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2019-12-20
タイトル
タイトル Constraints on the formation of brown dwarfs by turbulent compression
言語 en
著者 Stamer, Torsten

× Stamer, Torsten

WEKO 94913

en Stamer, Torsten

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Inutsuka, Shu-ichiro

× Inutsuka, Shu-ichiro

WEKO 94914

en Inutsuka, Shu-ichiro

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 This article has been accepted for publication in [Monthly Notices of the Royal Astronomical Society] ©: [2019] [authors] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
キーワード
主題Scheme Other
主題 brown dwarfs
キーワード
主題Scheme Other
主題 stars: formation
キーワード
主題Scheme Other
主題 stars: pre-main-sequence
抄録
内容記述 We perform radiation hydrodynamical simulations in spherical symmetry in order to investigate the formation of very low mass objects, i.e. brown dwarfs, by external compression. According to the Jeans stability criterion, a very low mass molecular cloud core must reach a very high density in order to become gravitationally unstable. One possibility to create such a high density is the compression by turbulent flows within the larger molecular cloud. Using our self-developed radiation hydrodynamics code, we aim to test the validity of this scenario, and to constrain the strength of the turbulence that is needed. We find that the probability for sufficiently strong and long-lived turbulence is very low under typical conditions even when using very optimistic assumptions, and therefore conclude that turbulent compression is unlikely to be the dominant mechanism for creating brown dwarfs. We also investigate the properties of objects formed by this turbulent compression process. Specifically, we compare the lifetime of the first core stage for the cases with and without external compression. We confirm our previous findings that the first core lifetime increases by about an order of magnitude at the extremely low-mass end, but this increase is somewhat less dramatic and occurs at even lower masses than in our previous work, in which no external compression was present.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 Oxford University Press
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1093/mnras/stz1892
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0035-8711
書誌情報 en : Monthly Notices of the Royal Astronomical Society

巻 488, 号 2, p. 2644-2649, 発行日 2019-09
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