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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
Published on: May 10, 2020
太阳系外行星CoRoT-1bb的变化阶段
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
概括
热木星CoRoT-1b的夜侧看起来完全是黑色的,它的白天流动主导着光学观测. 这表明有显著的昼夜温度对比,类似于太阳系内部的行星,反射光线最小.
科学领域:
- 外行星科学是外行星的科学.
- 天体物理学 天体物理学
- 星球科学 星球科学
背景情况:
- 热木星是靠近恒星运行的气体巨星,导致潮锁定和日夜之间极端的温度差异.
- 以前的红外观测已经为过境行星提供了白天温度,但光学波长为行星热量分布和反射性提供了不同的视角.
- 预计热木星的昼夜对比度在光学波长上会更高,这是由于发射波长较短以及反射恒星光的潜在增强.
研究的目的:
- 为了分析经过36个轨道的热木星CoRoT-1b的光学光度数据.
- 为了确定光学相曲线并评估CoRoT-1b在视觉波长上的昼夜对比度和反射率.
- 为了将CoRoT-1b的光学特征与我们太阳系内行星和其他热木星的光学特征进行比较.
主要方法:
- 来自CoRoT-1b. 36个行星轨道的光学光度数据的分析.
- 建模行星相位曲线以推断白天和夜晚的属性.
- 根据反射光计算几何色度的算法.
主要成果:
- 光学相曲线数据与CoRoT-1b的夜侧半球完全黑色一致.
- 日边流量显著主导观察到的光学相位曲线.
- 数据显示了低的几何白度 (<0.20),这表明反射恒星光的贡献很小.
结论:
- CoRoT-1b在光学波长上呈现出强烈的昼夜对比,夜侧几乎吸收了所有 incidente 光.
- 这颗行星的光学相变异与太阳系内部行星的相变异相当.
- 低的几何色度意味着反射光在行星所观察到的光学亮度中起的作用很小.
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