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原始的な隕石からの有機物質に記録された星間化学
Henner Busemann1, Andrea F Young, Conel M O'd Alexander
1Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA. busemann@dtm.ciw.edu
Science (New York, N.Y.)
|May 6, 2006
まとめ
隕石に含まれる原始的な有機物質は,惑星間塵の異質に匹敵する極度の同位体異常を示している. これは,両方の材料が,初期の太陽系の構成要素の重要な構成要素を保存していることを示唆しています.
科学分野:
- 宇宙化学 (コスモケミストリー)
- 天体生物学 アストロバイオロジー
- 惑星科学は惑星科学である.
背景:
- 地球外生命体のサンプルに含まれる有機物質は,水素と窒素の同位体異常を示している.
- これらの異常は,分子雲や原惑星円盤のようなプレソーラー環境の起源を示唆しています.
- 惑星間塵粒子 (IDP) は,以前は極度の同位体異常により,最も原始的な物質と考えられていた.
研究 の 目的:
- 炭酸性コンドライト有機物とIDPにおける水素と窒素の同位体組成を調べ,比較する.
- 炭酸性コンドライトが原始的な有機物質を,IDPの原始有機物質と同等またはそれ以上保存しているかどうかを判断する.
主な方法:
- 炭酸コンドリートからなる有機物質における水素と窒素の同位体組成物の分析.
- これらの同位体データを,惑星間塵粒子の既存のデータと比較する.
主要な成果:
- 炭酸性コンドライト内の有機物質は,IDPに含まれる水素と窒素の同位体組成を達し,超えている.
- この発見は,IDPは唯一最も原始的な太陽系物質であるという概念に異議を唱える.
結論:
- 隕石 (小惑星帯から) とIDP (彗星から来た可能性がある) の両方とも,原始的な有機物質を含んでいる.
- これらの原始的な有機物は,太陽系の最初の構成要素の不可欠な構成要素でした.
- この研究は,初期の太陽系における太陽前有機物質の分布と保存に関する私たちの理解を広げています.
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