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近くにある冷たい星を通過する温帯の岩石の超地球
Jason A Dittmann1, Jonathan M Irwin1, David Charbonneau1
1Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
Nature
|April 21, 2017
まとめ
LHS 1140bは M型矮星の居住可能領域にある 岩石系系外惑星です この近くの超地球は 大気を保持している可能性があり 将来の大気の研究の主なターゲットになります
科学分野:
- 外惑星科学
- 星の天体物理学
- 天体生物学
背景:
- M矮星は銀河で最も一般的な星です.
- M矮星を周回する地球サイズの系外惑星は,伝送スペクトロスコーピーを介して大気研究のためにアクセスできます.
- TRAPPIST-1のような 過去の発見は 質量や密度が 限られた惑星を生み出しました
研究 の 目的:
- 質量,組成,軌道パラメータに焦点を当てて,系外惑星LHS 1140bの特徴を述べる.
- LHS 1140bの恒星の液体水居住区内の居住可能性を評価する.
- 惑星の大気貯蔵能力を評価する
主な方法:
- 通過スペクトロスコピーは 恒星の前を通過する惑星を 観測するために使われました
- 惑星の質量を決定するために放射速度測定を用いた.
- 居住可能性と形成経緯を評価するために,内照度と軌道特異性が計算された.
主要な成果:
- LHS 1140bの半径は地球の1.4倍で 質量は地球の6.6倍で 岩の組成を示しています
- この惑星は 地球の0.46倍の太陽光を浴びて 居住可能な領域に入っています
- 低軌道離心率 (0.29の上限) は,軌道がおそらく原始であったことを示唆している.
結論:
- LHS 1140bは近くにある 居住可能な超地球で 岩石の組成が確認されています
- その特徴は,それが大気を保持している可能性を示唆し,それは将来の大気の特徴付けのための説得力のあるターゲットになります.
- LHS 1140bの近くと特性は,地球外惑星の研究と地球外生命の探求にとって重要な発見です.
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