文章基本信息

标题：The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets*
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作者：Benjamin J. Fulton ; Erik A. Petigura ; Andrew W. Howard 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2017
卷号：154
期号：3
DOI：10.3847/1538-3881/aa80eb
语种：English
出版社：American Institute of Physics
摘要：The size of a planet is an observable property directly connected to the physics of its formation and evolution. We used precise radius measurements from the California-Kepler Survey to study the size distribution of 2025 Kepler planets in fine detail. We detect a factor of ≥2 deficit in the occurrence rate distribution at 1.5–2.0 . This gap splits the population of close-in (P < 100 days) small planets into two size regimes: and , with few planets in between. Planets in these two regimes have nearly the same intrinsic frequency based on occurrence measurements that account for planet detection efficiencies. The paucity of planets between 1.5 and 2.0 supports the emerging picture that close-in planets smaller than Neptune are composed of rocky cores measuring 1.5 or smaller with varying amounts of low-density gas that determine their total sizes.
关键词：planetary systems Supporting material: machine-readable table