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ストラトスフィアの超高温ガスの巨大系外惑星
Thomas M Evans1, David K Sing1, Tiffany Kataria2
1Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK.
Nature
|August 4, 2017
まとめ
天文学者は WASP-121bで赤外線スペクトロスコーピーを用いて外惑星の平流層を検出しました この発見は,高度に照射された系外惑星に ストラトスフィアが存在することを確認し,大気組成と温度についての洞察を提供します.
科学分野:
- 外惑星科学
- 大気物理学
- 赤外線光譜法
背景:
- 惑星の大気は赤外線を放射し 化学組成と温度を明らかにします
- 高度に照射された系外惑星で 温度が上昇するストラトスフィアは形成されます
- 以前の,系外惑星の平流層の主張は,恒星の変動性と低スペクトル解像度による課題に直面した.
研究 の 目的:
- 超高温ガスの巨星WASP-121bの ストラトスフィアの存在と特性を調査する
- 放射能が強い系外惑星の 形成に関する観測的証拠を提供するためです
主な方法:
- 外惑星WASP-121bの近赤外線放射スペクトルを取得しました.
- 分子ガスを特定し,大気温プロファイルを推論するためにスペクトル特性を分析した.
- 以前の観測の限界を克服するために高精度測定を用いた.
主要な成果:
- 5シグマの信頼性で 惑星の外層の存在を確認しました
- WASP-121bは約2,500ケルビンの均衡温度を持っています.
- この発見は,高空での恒星放射線の有意な保持を示唆しています.
結論:
- WASP-121bの系外惑星の平流層の検出は,この現象の強力な観測証拠を提供します.
- 高空で留まったエネルギーは ヴァナジウム酸化物やチタニウム酸化物などに吸収されます
- この研究により 極端な系外惑星の 大気動力学と化学の理解が進んでいます
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