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タイトル
  • Pure iron grains are rare in the universe
作成者

Kimura, Yuki

Tanaka, Kyoko K.

Nozawa, Takaya

Takeuchi, Shinsuke

Inatomi, Yuko

権利情報
    • https://creativecommons.org/licenses/by-nc/4.0/
内容注記
Other
  • The abundant forms in which the major elements in the universe exist have been determined from numerous astronomical observations and meteoritic analyses. Iron (Fe) is an exception, in that only depletion of gaseous Fe has been detected in the interstellar medium, suggesting that Fe is condensed into a solid, possibly the astronomically invisible metal. To determine the primary form of Fe, we replicated the formation of Fe grains in gaseous ejecta of evolved stars by means of microgravity experiments. We found that the sticking probability for the formation of Fe grains is extremely small; only a few atoms will stick per hundred thousand collisions so that homogeneous nucleation of metallic Fe grains is highly ineffective, even in the Fe-rich ejecta of type Ia supernovae. This implies that most Fe is locked up as grains of Fe compounds or as impurities accreted onto other grains in the interstellar medium.
出版者The American Association for the Advancement of Science(AAAS)
日付 Issued 2017-01
言語eng
資源タイプjournal article
出版タイプVoR
資源識別子 URI http://hdl.handle.net/2115/64900
関連
  • isIdenticalTo DOI https://doi.org/10.1126/sciadv.1601992
収録誌情報
    • ISSN 2375-2548
    • Science advances
    3(1), e1601992
ファイル
コンテンツ更新日時2018-06-15T00:42:41Z