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M6星を通過する潮による温暖化がある地球サイズの温帯惑星
Merrin S Peterson1, Björn Benneke2, Karen Collins3
1Department of Physics and Trottier Institute for Research on Exoplanets, Université de Montréal, Montreal, Quebec, Canada.
Nature
|May 17, 2023
まとめ
天文学者は冷たいM型矮星を周回する 地球サイズの温帯系外惑星LP 791-18dを発見しました このユニークな惑星には 水の凝縮と火山活動に適した条件があり 外惑星の居住可能性に洞察を与えます
科学分野:
- 外惑星科学
- 天体生物学
- 星の天体物理学
背景:
- 地球サイズの温和な系外惑星は,惑星の居住可能性を理解するために不可欠です.
- このような惑星を検出するのは困難で TRAPPIST-1のような惑星系には 揮発性物質の証拠がないため 発見されたのはわずかです
- M矮星の小さな恒星半径は,大気中を通過するシグネチャーを強化し,系外惑星の特徴づけを助けます.
研究 の 目的:
- 地球サイズの新型温帯系系外惑星 LP791-18dが発見され 冷たいM6矮星を周回しています
- LP 791-18dの気候条件と水凝縮の可能性を調査する.
- 惑星系を特徴づけるため,軌道に並ぶ亜海王星の質量を含む,LP 791-18c.
主な方法:
- 外惑星の質量を決定するために,通過時間変数 (TTV) を利用した.
- 惑星系内の軌道動態と重力相互作用を分析した.
- 発見した系外惑星LP 791-18dの 均衡温度と半径を計算した.
主要な成果:
- 発見されたLP 791-18dは,地球サイズの系外惑星 (1.03 R) で,均衡温度300〜400Kである.
- 亜海王星LP 791-18cの質量は7.1 ± 0.7Mであると決定した.
- 重力相互作用が LP791-18dの 潮の加熱と火山の発生を 引き起こしていることがわかりました
結論:
- LP 791-18dは,水凝縮の可能性のある温帯系外惑星を研究するためのユニークなターゲットです.
- このシステムは,ガスが豊富な亜海王星と相互作用する エクソ地球を調査する機会を提供します.
- 継続的な潮による加熱は,LP 791-18dの重要な地質活動を示唆し,その潜在的な居住可能性に影響を与えています.
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