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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; Kitajima, Fumio; Naraoka, Hiroshi; Noguchi, Takaaki; Tsuchiyama, Akira; Yurimoto, Hisayoshi; Zolensky, Michael; Uesugi, Masayuki; Shirai, Kei; Abe, Masanao; Yada, Toru; Ishibashi, Yukihiro; Fujimura, Akio; Mukai, Toshifumi; Ueno, Munetaka; Okada, Tatsuaki; Yoshikawa, Makoto; Kawaguchi, Junichiro; Ireland, Trevor

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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...[Show more]

dc.contributor.authorNagao, Keisuke
dc.contributor.authorOkazaki, Ryuji
dc.contributor.authorNakamura, Tomoki
dc.contributor.authorMiura, Yayoi N.
dc.contributor.authorOsawa, Takahito
dc.contributor.authorBajo, Ken-ichi
dc.contributor.authorMatsuda, Shintaro
dc.contributor.authorEbihara, Mitsuru
dc.contributor.authorKitajima, Fumio
dc.contributor.authorNaraoka, Hiroshi
dc.contributor.authorNoguchi, Takaaki
dc.contributor.authorTsuchiyama, Akira
dc.contributor.authorYurimoto, Hisayoshi
dc.contributor.authorZolensky, Michael
dc.contributor.authorUesugi, Masayuki
dc.contributor.authorShirai, Kei
dc.contributor.authorAbe, Masanao
dc.contributor.authorYada, Toru
dc.contributor.authorIshibashi, Yukihiro
dc.contributor.authorFujimura, Akio
dc.contributor.authorMukai, Toshifumi
dc.contributor.authorUeno, Munetaka
dc.contributor.authorOkada, Tatsuaki
dc.contributor.authorYoshikawa, Makoto
dc.contributor.authorKawaguchi, Junichiro
dc.contributor.authorIreland, Trevor
dc.date.accessioned2015-12-13T22:15:58Z
dc.identifier.issn0036-8075
dc.identifier.urihttp://hdl.handle.net/1885/70642
dc.description.abstractNoble 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.
dc.publisherAmerican Association for the Advancement of Science
dc.sourceScience
dc.subjectKeywords: argon; helium; inert gas; isotope; neon; argon; asteroid; cosmic ray; helium; irradiance; neon; regolith; residence time; solar system; solar wind; spacecraft; article; astronomy; cosmic radiation; irradiation; meteorological phenomena; priority journal;
dc.titleIrradiation History of Itokawa Regolith Material Deduced from Noble Gases in the Hayabusa Samples
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume333
dc.date.issued2011
local.identifier.absfor020108 - Planetary Science (excl. Extraterrestrial Geology)
local.identifier.absfor040299 - Geochemistry not elsewhere classified
local.identifier.absfor020102 - Astronomical and Space Instrumentation
local.identifier.ariespublicationf2965xPUB2369
local.type.statusPublished Version
local.contributor.affiliationNagao, Keisuke, University of Tokyo
local.contributor.affiliationOkazaki, Ryuji, Kyushu University
local.contributor.affiliationNakamura, Tomoki, Tohuku University
local.contributor.affiliationMiura, Yayoi N., University of Tokyo
local.contributor.affiliationOsawa, Takahito, Japan Atomic Energy Agency
local.contributor.affiliationBajo, Ken-ichi, University of Tokyo
local.contributor.affiliationMatsuda, Shintaro, University of Tokyo
local.contributor.affiliationEbihara, Mitsuru, Tokyo Metropolitan University
local.contributor.affiliationIreland, Trevor, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKitajima, Fumio, Kyushu University
local.contributor.affiliationNaraoka, Hiroshi, Kyushu University
local.contributor.affiliationNoguchi, Takaaki, Ibaraki University
local.contributor.affiliationTsuchiyama, Akira, Osaka University
local.contributor.affiliationYurimoto, Hisayoshi, Hokkaido University
local.contributor.affiliationZolensky, Michael, NASA Johnson Space Center
local.contributor.affiliationUesugi, Masayuki, Japan Aerospace Exploration Agency
local.contributor.affiliationShirai, Kei, Japan Aerospace Exploration Agency
local.contributor.affiliationAbe, Masanao, Japan Aerospace Exploration Agency
local.contributor.affiliationYada, Toru, Japan Aerospace Exploration Agency
local.contributor.affiliationIshibashi, Yukihiro, Japan Aerospace Exploration Agency
local.contributor.affiliationFujimura, Akio, Japan Aerospace Exploration Agency
local.contributor.affiliationMukai, Toshifumi, Japan Aerospace Exploration Agency
local.contributor.affiliationUeno, Munetaka, Japan Aerospace Exploration Agency
local.contributor.affiliationOkada, Tatsuaki, Japan Aerospace Exploration Agency
local.contributor.affiliationYoshikawa, Makoto, Japan Aerospace Exploration Agency
local.contributor.affiliationKawaguchi, Junichiro, Japan Aerospace Exploration Agency
local.description.embargo2037-12-31
local.bibliographicCitation.issue6046
local.bibliographicCitation.startpage1128
local.bibliographicCitation.lastpage1131
local.identifier.doi10.1126/science.1207785
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T08:25:53Z
local.identifier.scopusID2-s2.0-80052171193
local.identifier.thomsonID000294244300043
CollectionsANU Research Publications

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