The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
摘要：
The questions of how planets form and how common Earth-like planets are can be addressed by measuring the distribution of exoplanet masses and orbital periods. We report the occurrence rate of close-in planets (with orbital periods less than 50 days), based on precise Doppler measurements of 166 Sun-like stars. We measured increasing planet occurrence with decreasing planet mass (M). Extrapolation of a power-law mass distribution fitted to our measurements, df/dlogM = 0.39 M(-0.48), predicts that 23% of stars harbor a close-in Earth-mass planet (ranging from 0.5 to 2.0 Earth masses). Theoretical models of planet formation predict a deficit of planets in the domain from 5 to 30 Earth masses and with orbital periods less than 50 days. This region of parameter space is in fact well populated, implying that such models need substantial revision.
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关键词：
Experimental/ extrasolar planetary mass/ Earth-like planets exoplanet masses orbital periods Doppler measurements Sun-like stars planet occurrence power-law mass distribution Earth-mass planet planet formation super-Earths Neptunes Jupiters/ A9780M Extrasolar planetary systems
DOI：
10.1126/science.1194854
被引量：
年份：
2010
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