塩水の貯水池は,エンケラドスの構成的に層分かれした羽根の源泉である
F Postberg1, J Schmidt, J Hillier
1Institut für Geowissenschaften, Universität Heidelberg, 69120 Heidelberg, Germany. Frank.Postberg@mpi-hd.mpg.de
Nature
|June 24, 2011
まとめ
エンケラドス (Enceladus) とは
科学分野:
- 惑星科学は惑星科学である.
- 天体生物学 アストロバイオロジー
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 土星の氷の月であるエンケラドスは,水蒸気と"虎のストライプ"の氷の粒子の羽ばたきを示しています.
- 以前の分析では液体の水が示唆されていたが,羽根形成のメカニズムについては議論が続いている.
- これらの羽根の起源 (液体源と氷の分解) は不明でした.
研究 の 目的:
- エンケラドスの羽根源の近くから新鮮に放出された粒子の組成を分析するために.
- エンケラドスの羽ばたき放射を駆動する主要なメカニズムを決定する.
- エンケラドスの地下環境のモデルを制限するために.
主な方法:
- 羽根源の近くで新鮮に放出された氷粒子のインシット分析.
- 塩分と有機化合物に焦点を当てた組成分析.
- 異なる粒子集団の質量流量および多量分析.
主要な成果:
- 塩分に富んだ氷粒子は,放出された固体質量流の99%以上を占めています.
- これらの塩分に富んだ粒子は,土星のE環に逃げる集団で枯渇しています.
- 有機化合物を含んだ氷粒は,密度の高い羽根地帯ではより豊富である.
- データは,大きな蒸発表面を持つ地下塩水貯蔵庫があることを強く示唆しています.
結論:
- この発見は,液体でない羽根形成モデルを排除するか,または厳しく制限する.
- 地下にある液体塩水の貯水池は,エンケラドスの羽根の最も妥当な源である.
- これは,エンケラドスの海内の居住可能性を支持しています.
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