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Updated: Jul 19, 2026

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Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
太陽系外惑星ウプシロン・アンドロメダ b bの相に依存する赤外線光度
Joseph Harrington1, Brad M Hansen, Statia H Luszcz
1Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
まとめ
アプシロン・アンドロメダの周りを回っている最も内側の惑星は,暑い昼側と寒い夜側を示しています. スピッツァー宇宙望遠鏡の観測は,宿主星との近さによるこの温度差を明らかにしています.
科学分野:
- 惑星外科学とは,惑星外科学です.
- 赤外線天文学の天文学
- 恒星系研究 恒星系研究
背景:
- アプシロン・アンドロメダは,既知の3つの惑星のシステムをホストしています.
- 最も内側の惑星は,短い軌道周期 (4.617日) とかなりの質量 (≥0.69木星質量) を有しています.
- この系外惑星が恒星に近いため,吸収された放射線は内部熱生成を上回る.
研究 の 目的:
- アンドロメダ系 (Upsilon Andromedae) の内側にある惑星の熱特性について調査する.
- 外惑星の表面における温度不対称性に関する観測的証拠を提示する.
- 外惑星の大気の研究のために赤外線光線曲線データを活用する.
主な方法:
- スピッツァー宇宙望遠鏡を用いたアップシロン・アンドロメダ系の観測.
- 24ミクロメートルの赤外線光曲線の取得と分析.
- 最内側の惑星の軌道相と光の曲線の変動の相関.
主要な成果:
- 24マイクロメートルの光の曲線で明確な相変化が検出されました.
- 観測された変動は,最も内側の惑星の軌道運動に直接対応しています.
- これは,惑星の亜星 (昼) 側と反星 (夜) 側との間に有意な温度差があることを示しています.
結論:
- 宿主恒星に近い系外惑星は,昼夜間の極端な温度相違を示します.
- アンドロメダという惑星の最も内側のアップシロンの亜星面は,その反星面よりもかなり熱い.
- 赤外線観測は,系外惑星の熱環境を特徴付けるための強力なツールです.
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