水星上の明るいと暗い極の堆積物:表面の揮発性物質の証拠
Gregory A Neumann1, John F Cavanaugh, Xiaoli Sun
1NASA Goddard Space Flight Center, Code 698, Greenbelt, MD 20771, USA. gregory.a.neumann@nasa.gov
まとめ
水星の北極付近の表面積は,明るい地域と暗い地域を示しています. これらの領域は,おそらく彗星によってもたらされた,水氷と絶縁有機物質である可能性があります.
科学分野:
- 惑星科学は惑星科学である.
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 表面地質物理学 表面地質物理学
背景:
- 水星の極の近くにある恒久的な影の領域 (PSR) は,揮発性物質の潜在的な貯蔵庫です.
- レーダー観測により,これらの地域で地表近くの水氷の存在が示唆されています.
研究 の 目的:
- 水星の北極PSRにおける異常な表面積の組成と起源を調査する.
- 表面反射特性と熱モデルとレーダー逆分散を相関させるため.
主な方法:
- 1064ナノメートルの波長での表面反射度測定の分析.
- 反射力のデータとモデルの表面温度との相関.
- 高いレーダーバックスケーター領域との反射異常の比較.
主要な成果:
- 観測された反射率の異常は,暗くも明るくも,極面向きの斜面に集中しています.
- 光学的に明るい領域は,地表水の氷と一致しています.
- 光学的に暗い領域は,埋められた氷の上に覆われている複雑な有機物質の表面層を示唆します.
結論:
- 観測された堆積物は,水氷と有機物質の混合物である可能性が高い.
- 彗星や小惑星の衝突は,これらの堆積物の潜在的な源である.
- 有機物質は,地表の氷の熱絶縁剤を提供することがあります.
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