地球化学
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
2006年度日本地球化学会奨励賞受賞記念論文
消滅核種存在度から考える太陽系誕生環境
橘 省吾
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ジャーナル オープンアクセス

2009 年 43 巻 4 号 p. 213-226

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The presence of several short-lived, now extinct, radionuclides in the early solar system has been confirmed through measurements of excesses of daughter isotopes that correlate with the abundances of their parent elements in cogenetic minerals in meteorites. Some of such short-lived radionuclides should have formed just prior to or soon after the solar system formation either by stellar nucleosynthesis or by energetic-particle irradiation. A short-lived rdionuclide 60Fe ins produced only in stars and thus provides a constraint on the stellar contribution to solar system radionuclides. Clear evidence of the presence of 60Fe in the early solar system has been found in various components in meteorites. The estimated initial abundance of 60Fe in the solar system cannot be explained byheritage from the interstellar medium, but requires the injection of 60Fe into the proto solar materials from a nearby star. Although no previous model succeeded to explain the abundances of the short-lived radionuclides (26Al, 41Ca, 53Mn, and 60Fe) by injection from asingle stellar source, I propose here that a faint super nova with mixing and fallback can match the solar-system abundances of 26Al, 41Ca, 53Mn, and 60Fe suggesting that the solar system formed nearby a massive star.

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© 2009 日本地球化学会
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