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标题：Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
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作者：Jerome A. Orosz ; William F. Welsh ; Nader Haghighipour 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2019
卷号：157
期号：5
页码：1-46
DOI：10.3847/1538-3881/ab0ca0
语种：English
出版社：American Institute of Physics
摘要：Of the nine confirmed transiting circumbinary planet systems, only Kepler-47 is known to contain more than one planet. Kepler-47 b (the “inner planet”) has an orbital period of 49.5 days and a radius of about 3 R ⊕ . Kepler-47 c (the “outer planet”) has an orbital period of 303.2 days and a radius of about 4.7 R ⊕ . Here we report the discovery of a third planet, Kepler-47 d (the “middle planet”), which has an orbital period of 187.4 days and a radius of about 7 R ⊕ . The presence of the middle planet allows us to place much better constraints on the masses of all three planets, where the 1σ ranges are less than 26 M ⊕ , between 7–43 M ⊕ , and between 2–5 M ⊕ for the inner, middle, and outer planets, respectively. The middle and outer planets have low bulk densities, with 0.68 middle r < g cm −3 and ρ outer <0.26 g cm −3 at the 1σ level. The two outer planets are “tightly packed,” assuming the nominal masses, meaning no other planet could stably orbit between them. All of the orbits have low eccentricities and are nearly coplanar, disfavoring violent scattering scenarios and suggesting gentle migration in the protoplanetary disk.
关键词：eclipsing;planets and satellites: detection;planets and satellites: fundamental parameters;stars: fundamental parameters Supporting material: machine-readable tables