基于相位分辨发射光谱的系外行星大气热结构
地球与行星天体物理
2014-11-18 v1 天体物理仪器与方法
摘要
绕其宿主恒星近距离运行的系外行星受到的辐射照射远高于太阳系内的对应天体。理解这些行星的热结构和外观需要研究其大气层如何响应这种极端的恒星强迫。我们利用哈勃空间望远镜 (Hubble Space Telescope)，对高辐射系外行星 WASP-43b 进行了跨越三个完整行星自转周期的轨道相位函数光谱热发射测量（“相位曲线观测”）。利用这些数据，我们构建了该行星大气的热结构图，发现所有测量高度处均存在巨大的昼夜温差，且所有经度处的温度均随压力单调递减。我们还推导出邦德反照率 (Bond albedo) 为 0.18 +0.07,-0.12，并发现热点相对于星下点的偏移量存在高度依赖性。
引用
@article{arxiv.1410.2241,
title = {Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy},
author = {Kevin B. Stevenson and Jean-Michel Desert and Michael R. Line and Jacob L. Bean and Jonathan J. Fortney and Adam P. Showman and Tiffany Kataria and Laura Kreidberg and Peter R. McCullough and Gregory W. Henry and David Charbonneau and Adam Burrows and Sara Seager and Nikku Madhusudhan and Michael H. Williamson and Derek Homeier},
journal= {arXiv preprint arXiv:1410.2241},
year = {2014}
}
备注
28 pages, 12 figures, 1 movie, includes supplementary materials, accepted for publication in Science. Also see two companion papers titled "A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b" by Kreidberg et al. (2014b) and "The atmospheric circulation of the hot Jupiter WASP-43b: Comparing three-dimensional models to spectrophotometric data" by Kataria et al. (2014)