文章基本信息

标题：A cautionary tale: limitations of a brightness-based spectroscopic approach to chromatic exoplanet radii
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作者：H. M. Cegla ; H. M. Cegla ; C. Lovis 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：598
页码：1-5
DOI：10.1051/0004-6361/201629981
语种：English
出版社：EDP Sciences
摘要：Determining wavelength-dependent exoplanet radii measurements is an excellent way to probe the composition of exoplanet atmospheres. In light of this, Borsa et al. (2016) sought to develop a technique to obtain such measurements by comparing ground-based transmission spectra to the expected brightness variations during an exoplanet transit. However, we demonstrate herein that this is not possible due to the transit light curve normalisation necessary to remove the effects of the Earth’s atmosphere on the ground-based observations. This is because the recoverable exoplanet radius is set by the planet-to-star radius ratio within the transit light curve; we demonstrate this both analytically and with simulated planet transits, as well as through a reanalysis of the HD 189733 b data.
关键词：methods: data analysis;planets and satellites: atmospheres;planets and satellites: fundamental parameters;planets and satellites: individual: HD 189733 b;techniques: radial velocities;techniques: spectroscopic