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木星系彗星103P/ハートリー2の海のような水
Paul Hartogh1, Dariusz C Lis, Dominique Bockelée-Morvan
1Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany. hartogh@mps.mpg.de
Nature
|October 7, 2011
まとめ
彗星103P/ハートリー2のデウテリウムと水素の比率は,地球の海水と一致しています. この発見は,小惑星だけでなく,いくつかの彗星が,初期の地球に水を運んだことを示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- アストロケミストリー アストロケミストリー
- 初期の太陽系進化について
背景:
- 地球の水の起源,特に (1.558 ± 0.001) × 10−4 のデウテリウムと水素 (D/H) の比率については,議論が続いている.
- 地球の組成はエンスタタイト型コンドライトに似ており,乾燥した初期の地球を暗示し,後に小惑星や彗星によって揮発性物質が運ばれた.
- 以前の研究では,小惑星が主要な水源であると示され,オート雲彗星はD/H比 (2.96 ± 0.25 × 10−4) が高く,炭酸コンドライトはD/H比が低い (1.4 ± 0.1 × 10−4) であった.
研究 の 目的:
- 木星系彗星103P/ハートリー2のD/H比を調査する.カイパーベルトから発生した.
- 地球の水資源に彗星が与える影響を評価する.
- 初期の太陽系動力学と不安定な配送のモデルを精錬する.
主な方法:
- 彗星103P/ハートレーの水中のデウテリウムと水素 (D/H) の比率の測定 2.
- 測定されたD/H比を地球の海や他の太陽系天体と比較する.
- 揮発性配送と太陽系形成に関する既存のモデルの文脈における分析.
主要な成果:
- 彗星103P/ハートリー2のD/H比は (1.61 ± 0.24) × 10−4.4と決定されました.
- この値は,地球の大量の水のD/H比に非常に似ています.
- この発見は,地球の海洋のような水の潜在的な源を,特定の彗星を含むように拡張します.
結論:
- 彗星,特に103P/ハートリー2のようなカイパーベルトの彗星は,地球の水の重要な源である可能性があります.
- この結果は,初期の太陽系のダイナミックな進化と揮発性増殖のより複雑なモデルを裏付けている.
- この研究は,以前の不一致を調和させ,惑星の水の起源に関する私たちの理解を広げています.
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