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地球外惑星LHS 3844bに厚い大気がない
Laura Kreidberg1, Daniel D B Koll2, Caroline Morley3
1Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA. laura.kreidberg@cfa.harvard.edu.
Nature
|August 21, 2019
まとめ
熱い地上の系外惑星は 小さな恒星の周りを回っているので 厚い大気が欠けているかもしれません LHS 3844bの新しい観測は,裸の岩の表面を明らかにし,恒星風と高温による大気浸食を示唆しています.
科学分野:
- 外惑星科学
- 大気物理学
- 星の天体物理学
背景:
- 既知の地上の系外惑星のほとんどは小さな恒星の周りを回っており 理論的には大気を失う傾向があります
- 熱相曲線に基づいた大気循環が示唆された.
- M矮星を周回する系外惑星の大気保持を調査することは,惑星の居住可能性を理解するために不可欠です.
研究 の 目的:
- 外惑星LHS 3844bの熱相曲線を測定し,その大気の性質を評価する.
- 小惑星LHS 3844bが 大気を保持しているかどうか
- 小さな恒星を周回する惑星の 大気の脆弱性に関する理論的予測を テストするためです
主な方法:
- 外惑星LHS 3844bの熱相曲線観測を行った.
- 昼と夜の気温を分析した
- 大気圧とアルベドを制限するために 大気と裸岩のシナリオを使用してデータをモデル化しました.
主要な成果:
- LHS 3844bの相変化は,幅広く対称であることが判明しました.
- 昼間の明るさの温度が 1,040 ± 40 Kで,夜間の温度が 0 K近くであった.
- 厚い大気 (表面圧 > 10 bar) は排除され,データは低アルベドの裸岩モデルに適合した.
結論:
- LHS 3844bは,大気がほとんどない裸の岩の表面を有している可能性があります.
- 小さな恒星を回っている熱い惑星は 恒星風による大気浸食に敏感です
- この発見は,M型矮星を周りの系外惑星の大気の損失を予測する理論的モデルを裏付けている.
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