Pure iron grains are rare in the universe

Kimura, Yuki; Tanaka, Kyoko K.; Nozawa, Takaya; Takeuchi, Shinsuke; Inatomi, Yuko

Pure iron grains are rare in the universe

Kimura, Yuki; Tanaka, Kyoko K.; Nozawa, Takaya et al.

Science advances, 2017, 3(1), e1601992

Permalink : https://hdl.handle.net/2115/64900

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/64900
タイトル	Pure iron grains are rare in the universe
著者	Kimura, Yuki ; Tanaka, Kyoko K. ; Nozawa, Takaya ; Takeuchi, Shinsuke ; Inatomi, Yuko
e-Rad_Researcher 50449542 著者名 Kimura, Yuki
著者名 Tanaka, Kyoko K.
著者名 Nozawa, Takaya
著者名 Takeuchi, Shinsuke
著者名 Inatomi, Yuko
言語	英語
発行日	2017-01
出版者	The American Association for the Advancement of Science（AAAS）
収録物名	Science advances
巻(号)	3(1)
ページ	e1601992
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution-NonCommercial 4.0 International
PISSN	2375-2548
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1126/sciadv.1601992