文章基本信息

标题：The Dark Planets of the WASP-47 Planetary System
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作者：Stephen R.Kane ; Tara Fetherolf ; Michelle L.Hill 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：4
页码：2468-2477
DOI：10.3847/1538-3881/ab7818
语种：English
出版社：American Institute of Physics
摘要：Exoplanet discoveries have demonstrated a vast range of planetary system architectures.The demographic of compact planetary systems are especially interesting from the perspective of planetary formation and the evolution of orbital dynamics.Another interesting demographic is that of giant planets in eccentric orbits, since these planets have likely had a dynamical history involving planet–planet scattering events.The WASP-47 system is particularly fascinating since it combines these two demographics, having both compact planetary orbits and a giant planet on an eccentric orbit within the system the habitable zone.Here we provide an analysis of the WASP-47 system from the perspective of atmospheric detection and characterization.We discuss the system architecture and the potential for additional long-period planets.We simulate expected phase variations as a function of planet orbital phase for the system due to the combined effect of the planets.We present an analysis of precision photometry of WASP-47 from the K2 mission, phased on each of the planets.The analysis rules out the detection of phase signatures for the two inner-most planets, enabling constraints upon their albedos and atmospheric properties.Our study concludes that WASP-47b is an example of a "dark" planet with a tentative geometric albedo of 0.016 and a 1σ upper limit of 0.17.The WASP-47e data are consistent with a broad range of albedos, but also show early evidence of having a relatively low albedo.The growing number of dark, short-period giant planets provide the framework of an ideal sample for studying low albedo dependence on atmospheric composition.
关键词：Exoplanet atmospheres;Exoplanet systems;Exoplanet detection methods;Natural satellites (Extrasolar)