REVEALING A UNIVERSAL PLANET-METALLICITY CORRELATION FOR PLANETS OF DIFFERENT SOLAR-TYPE STARS

被引:129
作者
Wang, Ji [1 ]
Fischer, Debra A. [1 ]
机构
[1] Yale Univ, Dept Astron, New Haven, CT 06511 USA
关键词
methods: observational; methods: statistical; planetary systems; planets and satellites: fundamental parameters; techniques: photometric; PROTOPLANETARY DISK STRUCTURES; CANDIDATE HOST STARS; STELLAR MULTIPLICITY; MAIN-SEQUENCE; STATISTICAL PROPERTIES; METAL-RICH; KEPLER; MASS; EXOPLANETS; FREQUENCY;
D O I
10.1088/0004-6256/149/1/14
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The metallicity of exoplanet systems serves as a critical diagnostic of planet formation mechanisms. Previous studies have demonstrated the planet-metallicity correlation for large planets (R-P >= 4 R-E); however, a correlation has not been found for smaller planets. With a sample of 406 Kepler objects of interest whose stellar properties are determined spectroscopically, we reveal a universal planet-metallicity correlation: not only gas-giant planets (3.9 R-E < R-P <= 22.0 R-E) but also gas-dwarf (1.7 R-E < R-P <= 3.9 R-E) and terrestrial planets (R-P <= 1.7 R-E) occur more frequently in metal-rich stars. The planet occurrence rates of gas-giant planets, gas-dwarf planets, and terrestrial planets are 9.30(+3.04)(+5.62), 2.03(-0.26)(+0.29), and 1.72(-0.17)(+0.19) times higher for metal-rich stars than for metal-poor stars, respectively.
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页数:7
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