• DOI:10.1088/0004-6256/149/1/14
• Corpus ID: 118415186

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

@article{Wang2013REVEALINGAU,
  title={REVEALING A UNIVERSAL PLANET–METALLICITY CORRELATION FOR PLANETS OF DIFFERENT SIZES AROUND SOLAR-TYPE STARS},
  author={Ji Wang and Debra A. Fischer},
  journal={The Astronomical Journal},
  year={2013},
  volume={149}
}

• Ji Wang, D. Fischer
• Published 29 October 2013
• Physics, Geology
• The Astronomical Journal

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.