Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples

Keisuke Nagao, Ryuji Okazaki, Tomoki Nakamura, Yayoi N. Miura, Takahito Osawa, Ken Ichi Bajo, Shintaro Matsuda, Mitsuru Ebihara, Trevor R. Ireland, Fumio Kitajima, Hiroshi Naraoka, Takaaki Noguchi, Akira Tsuchiyama, Hisayoshi Yurimoto, Michael E. Zolensky, Masayuki Uesugi, Kei Shirai, Masanao Abe, Toru Yada, Yukihiro IshibashiAkio Fujimura, Toshifumi Mukai, Munetaka Ueno, Tatsuaki Okada, Makoto Yoshikawa, Junichiro Kawaguchi

研究成果: Article

78 引用 (Scopus)

抄録

Noble gas isotopes were measured in three rocky grains from asteroid Itokawa to elucidate a history of irradiation from cosmic rays and solar wind on its surface. Large amounts of solar helium (He), neon (Ne), and argon (Ar) trapped in various depths in the grains were observed, which can be explained by multiple implantations of solar wind particles into the grains, combined with preferential He loss caused by frictional wear of space-weathered rims on the grains. Short residence time of less than 8 million years was implied for the grains by an estimate on cosmic-ray-produced 21Ne. Our results suggest that Itokawa is continuously losing its surface materials into space at a rate of tens of centimeters per million years. The lifetime of Itokawa should be much shorter than the age of our solar system.

元の言語English
ページ(範囲)1128-1131
ページ数4
ジャーナルScience
333
発行部数6046
DOI
出版物ステータスPublished - 2011 8 26
外部発表Yes

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Noble Gases
Helium
Minor Planets
Neon
Argon
Solar System
Isotopes

ASJC Scopus subject areas

  • General

これを引用

Nagao, K., Okazaki, R., Nakamura, T., Miura, Y. N., Osawa, T., Bajo, K. I., ... Kawaguchi, J. (2011). Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples. Science, 333(6046), 1128-1131. https://doi.org/10.1126/science.1207785

Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples. / Nagao, Keisuke; Okazaki, Ryuji; Nakamura, Tomoki; Miura, Yayoi N.; Osawa, Takahito; Bajo, Ken Ichi; Matsuda, Shintaro; Ebihara, Mitsuru; Ireland, Trevor R.; Kitajima, Fumio; Naraoka, Hiroshi; Noguchi, Takaaki; Tsuchiyama, Akira; Yurimoto, Hisayoshi; Zolensky, Michael E.; Uesugi, Masayuki; Shirai, Kei; Abe, Masanao; Yada, Toru; Ishibashi, Yukihiro; Fujimura, Akio; Mukai, Toshifumi; Ueno, Munetaka; Okada, Tatsuaki; Yoshikawa, Makoto; Kawaguchi, Junichiro.

:: Science, 巻 333, 番号 6046, 26.08.2011, p. 1128-1131.

研究成果: Article

Nagao, K, Okazaki, R, Nakamura, T, Miura, YN, Osawa, T, Bajo, KI, Matsuda, S, Ebihara, M, Ireland, TR, Kitajima, F, Naraoka, H, Noguchi, T, Tsuchiyama, A, Yurimoto, H, Zolensky, ME, Uesugi, M, Shirai, K, Abe, M, Yada, T, Ishibashi, Y, Fujimura, A, Mukai, T, Ueno, M, Okada, T, Yoshikawa, M & Kawaguchi, J 2011, 'Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples', Science, 巻. 333, 番号 6046, pp. 1128-1131. https://doi.org/10.1126/science.1207785
Nagao K, Okazaki R, Nakamura T, Miura YN, Osawa T, Bajo KI その他. Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples. Science. 2011 8 26;333(6046):1128-1131. https://doi.org/10.1126/science.1207785
Nagao, Keisuke ; Okazaki, Ryuji ; Nakamura, Tomoki ; Miura, Yayoi N. ; Osawa, Takahito ; Bajo, Ken Ichi ; Matsuda, Shintaro ; Ebihara, Mitsuru ; Ireland, Trevor R. ; Kitajima, Fumio ; Naraoka, Hiroshi ; Noguchi, Takaaki ; Tsuchiyama, Akira ; Yurimoto, Hisayoshi ; Zolensky, Michael E. ; Uesugi, Masayuki ; Shirai, Kei ; Abe, Masanao ; Yada, Toru ; Ishibashi, Yukihiro ; Fujimura, Akio ; Mukai, Toshifumi ; Ueno, Munetaka ; Okada, Tatsuaki ; Yoshikawa, Makoto ; Kawaguchi, Junichiro. / Irradiation history of itokawa regolith material deduced from noble gases in the hayabusa samples. :: Science. 2011 ; 巻 333, 番号 6046. pp. 1128-1131.
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AU - Nagao, Keisuke

AU - Okazaki, Ryuji

AU - Nakamura, Tomoki

AU - Miura, Yayoi N.

AU - Osawa, Takahito

AU - Bajo, Ken Ichi

AU - Matsuda, Shintaro

AU - Ebihara, Mitsuru

AU - Ireland, Trevor R.

AU - Kitajima, Fumio

AU - Naraoka, Hiroshi

AU - Noguchi, Takaaki

AU - Tsuchiyama, Akira

AU - Yurimoto, Hisayoshi

AU - Zolensky, Michael E.

AU - Uesugi, Masayuki

AU - Shirai, Kei

AU - Abe, Masanao

AU - Yada, Toru

AU - Ishibashi, Yukihiro

AU - Fujimura, Akio

AU - Mukai, Toshifumi

AU - Ueno, Munetaka

AU - Okada, Tatsuaki

AU - Yoshikawa, Makoto

AU - Kawaguchi, Junichiro

PY - 2011/8/26

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