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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
Published on: May 10, 2020
太陽系外惑星COROT-1bbの相変化について
Ignas A G Snellen1, Ernst J W de Mooij, Simon Albrecht
1Leiden Observatory, Leiden University, Postbus 9513, 2300 RA Leiden, The Netherlands. snellen@strw.leidenuniv.nl
Nature
|May 30, 2009
まとめ
熱い木星のコロト-1bの夜面は完全に黒く見えますが,昼面の流動が光学観測を支配しています. これは,太陽系内部の惑星と似ており,光の反射が最小限にあるような,昼夜間の気温の大きな相違を示唆しています.
科学分野:
- 外惑星科学とは,外惑星科学のこと.
- 天体物理学 天体物理学
- 惑星科学は惑星科学である.
背景:
- ホットジュピターは,恒星の近くを軌道に回るガスの巨星であり,潮のロックと昼と夜間の極端な温度差をもたらします.
- 以前の赤外線観測は,通過する惑星の昼間の温度を提供しましたが,光学波長は惑星の熱分布と反射性に関する異なる視点を提供します.
- 熱い木星の昼夜コントラストは,より短い放射波長と反射された星光による潜在的強化により,光学波長でより高いと予測されています.
研究 の 目的:
- 熱い木星CoRoT-1bの36回軌道を通過した光学フォトメトリックデータを分析するために.
- 視覚波長における CoRoT-1b の光学相曲線を決定し,昼夜コントラストと反射率を評価する.
- CoRoT-1bの光学特性を,太陽系内部の惑星や他の熱い木星と比較するためです.
主な方法:
- CoRoT-1b.の36の惑星軌道からの光学フォトメトリックデータの分析.
- 惑星の相曲線をモデル化して,昼と夜の性質を推測する.
- 反射光による幾何学的アルベドの計算.
主要な成果:
- 光学相曲線データは,CoRoT-1bの夜側半球が完全に黒であることに一致しています.
- 日面流は観測された光学相曲線を著しく支配する.
- データは低幾何学的アルベド (<0.20) を示し,反射された恒星光による最小の寄与を示唆しています.
結論:
- CoRoT-1bは,光学波長で強い昼夜コントラストを示し,夜側がほぼすべての照明を吸収します.
- この惑星の光学相の変動は,太陽系内部の惑星の相に匹敵する.
- 低幾何学的アルベドは,反射された光が惑星の観測された光学的明るさにおいて小さな役割を果たしていることを示唆しています.
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