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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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超地球系外惑星の大きな昼夜温度グラデーションの地図
Brice-Olivier Demory1, Michael Gillon2, Julien de Wit3
1Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
Nature
|March 31, 2016
まとめ
熱点と昼と夜間の極端な温度差を明らかにした. 熱点と夜間の極端な温度差を明らかにした. 大気かマグマの流れによる 低効率な熱分布を示唆しています
科学分野:
- 外惑星科学
- 大気物理学
- 赤外線天文学
背景:
- 外惑星の大気の観測は 特に超地球のような 低質量惑星の観測は 困難です
- 超地球スペクトルを研究する以前の試みは 特徴のない結果をもたらしました
- 巨大系外惑星の観測は 洞察力をもたらしますが 質量が小さい系外惑星は まだ研究されていません
研究 の 目的:
- 超地球55 Cancri eの縦断的な熱輝度マップを作成する.
- 55 Cancri eの大気特性と熱分布を調査する.
- 超地球が通過する時の 熱の放射と温度の違いを理解するために
主な方法:
- 55 Cancri eの宇宙ベースの赤外線モニタリング
- 惑星が恒星を周回する時の熱流変調の分析
- 温度変動を決定するための軌道相曲線の構築.
主要な成果:
- 非常に非対称な昼間の熱放射が観測された.
- 日と夜の気温の大きな相違が観測され,その熱点は亜星点の東にある.
- 夜の照明温度が1,380 ± 400 Kに制限されている.
- 最も暖かい半球の温度は4,5マイクロメートルで2,700 ±270Kで測定された.
結論:
- 55 Cancri eの昼側から夜側への非効率的な熱再分配
- 観測は,熱を閉じ込めている厚い大気か,表面マグマの流れがある大気のない惑星と一致しています.
- この研究は 超地球温暖化と大気動態の 複雑さを強調しています
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