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Title:
Revealing a Universal Planet-Metallicity Correlation for Planets of Different Sizes Around Solar-type Stars
Authors:
Wang, Ji; Fischer, Debra A.
Affiliation:
AA(Department of Astronomy, Yale University, New Haven, CT 06511, USA 0000-0002-4361-8885), AB(Department of Astronomy, Yale University, New Haven, CT 06511, USA 0000-0003-2221-0861)
Publication:
The Astronomical Journal, Volume 149, Issue 1, article id. 14, 7 pp. (2015). (AJ Homepage)
Publication Date:
01/2015
Origin:
IOP
Astronomy Keywords:
methods: observational, methods: statistical, planetary systems, planets and satellites: fundamental parameters, techniques: photometric
DOI:
10.1088/0004-6256/149/1/14
Bibliographic Code:
2015AJ....149...14W

Abstract

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} ≥slant 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} \lt {{R}P} ≤slant 22.0 {{R}E}) but also gas-dwarf (1.7 {{R}E} \lt {{R}P} ≤slant 3.9 {{R}E}) and terrestrial planets ({{R}P} ≤slant 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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