Kepler-47: A Transiting Circumbinary Multi-Planet System
摘要：
We report the detection of Kepler-47, a system consisting of two planets orbiting around an eclipsing pair of stars. The inner and outer planets have radii 3.0 and 4.6 times that of the Earth, respectively. The binary star consists of a Sun-like star and a companion roughly one-third its size, orbiting each other every 7.45 days. With an orbital period of 49.5 days, eighteen transits of the inner planet have been observed, allowing a detailed characterization of its orbit and those of the stars. The outer planet's orbital period is 303.2 days, and although the planet is not Earth-like, it resides within the classical "habitable zone", where liquid water could exist on an Earth-like planet. With its two known planets, Kepler-47 establishes that close binary stars can host complete planetary systems.
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关键词：
Experimental/ binary stars celestial mechanics transits/ circumbinary multiplanet system binary star Sun-like star transit system planet orbit characterization outer planet orbital period classical habitable zone Earth-like planet planetary systems Kepler-47/ A9510G Eclipses, transits and occultations A9780 Binary and multiple stars A9510C Celestial mechanics/ Kepler-47
DOI：
10.1126/science.1228380
被引量：
年份：
2012
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