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Comet Assay as an Indirect Measure of Systemic Oxidative Stress
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彗星67P/チュリュモフ・ゲラシメンコのコマに豊富な分子酸素
A Bieler1,2, K Altwegg2,3, H Balsiger2
1Department of Climate and Space Science and Engineering, University of Michigan, 2455 Hayward Street, Ann Arbor, Michigan 48109, USA.
Nature
|October 30, 2015
まとめ
彗星67P/チュリュモフ・ゲラシメンコで分子酸素 (O2) が検出されました.
科学分野:
- 彗星科学
- 天体化学
- 惑星科学
背景:
- 彗星のコマは主にH2O,CO,CO2で構成されています.
- 硫黄化合物や炭化水素などの他の分子も存在します
- 分子酸素 (O2) は他の氷の体では検出されましたが,彗星では検出されていません.
研究 の 目的:
- 彗星67P/Churyumov-Gerasimenkoのコマで分子酸素 (O2) が発見されたことを報告する.
- O2とH2Oの比重を定量化するために
- 彗星の核における O2 の分布と起源を調査する.
主な方法:
- 彗星67P/チュリュモフ・ゲラシメンコの中性ガス組成のインサイト測定.
- H2Oに対する O2 濃度の分析
- O2/H2O比の同otropyと太陽中心距離による依存性の評価
主要な成果:
- 分子酸素 (O2) は,彗星67P/チュリュモフ・ゲラシメンコのコマで検出されました.
- 局所O2濃度はH2Oに対して1%から10%の範囲で,平均は3. 80±0. 85%であった.
- O2/H2O比は同位体であり,太陽中心距離とは無関係であることが判明した.
結論:
- O2の存在は 彗星の形成過程で 彗星の核に原始的に組み込まれていることを示しています
- この発見は現在の太陽系形成モデルに 異議を唱えます
- O2を組み込むための条件を理解するためにさらなる研究が必要である.
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