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近くの低質量恒星を通過する岩石惑星
Zachory K Berta-Thompson1,2, Jonathan Irwin2, David Charbonneau2
1Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Nature
|November 13, 2015
まとめ
M型矮星には 地球サイズの惑星が たくさんあります 近くの系外惑星であるGJ 1132bは 地球に似た密度と 大量の大気を備えており 将来の大気研究の主なターゲットとなっています
科学分野:
- 天文学と天体物理学
- 外惑星科学
背景:
- M矮星は最も一般的な星で,太陽のような星を12:1で上回ります.
- 最近の発見は,M矮星は地球サイズの惑星 (0.5-1.5地球半径) を豊富にホストし,平均で少なくとも1つに1.4があることを示しています.
- 以前発見されたM矮星の周りを通過する惑星は 詳細な大気や質量分析には 遠すぎていた.
研究 の 目的:
- GJ 1132bの観測を報告する. 近隣のM型矮星を周回する系外惑星.
- GJ 1132bの大気成分と大気力を決定する
- 既存の望遠鏡と将来の望遠鏡を使用して,将来の大気特性を示すのに適した標的を特定する.
主な方法:
- 外惑星GJ 1132bのドップラー質量測定を行った.
- 惑星の大きさ (1.2地球の半径) と軌道特性を分析した.
- 惑星が受けた恒星放射線と大気保持への影響を評価した.
主要な成果:
- GJ 1132bは,地球のような質量の組成に一致する密度を持っています.
- 地球より19倍も多くの 恒星放射線を 受けているので 居住可能には あまりにも暑いのです
- 高温にもかかわらず,GJ 1132bは水素がほとんどない大気を支える能力を持っています.
結論:
- GJ 1132bは,その近さと地球のような特性により,重要な発見を表しています.
- 惑星の大気は水素が少ないが 研究に利用可能だ
- GJ 1132bは,現在および将来の観測所による詳細な大気組成と動力学的研究のための優れたターゲットとして機能します.
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