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

By Ji Wang, Debra A. Fischer. 2013

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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.

Subfields: Astronomy and Astrophysics, Geophysics

View Paper: https://www.semanticscholar.org/paper/7de54a554660a090a68c3f6fe59f1f2acda206fb

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IN SITU FORMATION AND DYNAMICAL EVOLUTION OF HOT JUPITER SYSTEMS (2015, background): “Indeed, statistical evidence has been marshaled in support of the existence of a positive correlation between super Earth radii (and by extension, planetary mass) and stellar metallicity (Buchhave et al. 2014; Wang and Fischer 2015).”