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Constraints on the formation of brown dwarfs by turbulent compression
http://hdl.handle.net/2237/00031026
http://hdl.handle.net/2237/000310261c88ab89-a8be-493c-99db-1ebaa9be6cac
名前 / ファイル | ライセンス | アクション |
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stz1892 (318.4 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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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× Inutsuka, Shu-ichiro |
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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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著者版フラグ | ||||||
値 | publisher |