Revealing A Universal Planet-Metallicity Correlation For Planets of Different Sizes Around Solar-Type Stars

  title={Revealing A Universal Planet-Metallicity Correlation For Planets of Different Sizes Around Solar-Type Stars},
  author={Ji Wang and D. Fischer},
  journal={arXiv: Earth and Planetary Astrophysics},
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 ($R_P\ \geq\ 4\ R_E$); 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\ \leq\ 22.0\ R_E… Expand

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