The California-Kepler Survey. X. The Radius Gap as a Function of Stellar Mass, Metallicity, and Age

@article{Petigura2022TheCS,
  title={The California-Kepler Survey. X. The Radius Gap as a Function of Stellar Mass, Metallicity, and Age},
  author={Erik A. Petigura and James G Rogers and Howard T. Isaacson and James E. Owen and Adam L. Kraus and Joshua N. Winn and Mason G. MacDougall and Andrew W. Howard and Benjamin J. Fulton and Molly R. Kosiarek and Lauren M. Weiss and Aida Behmard and Sarah C. Blunt},
  journal={The Astronomical Journal},
  year={2022},
  volume={163}
}
In 2017, the California-Kepler Survey (CKS) published its first data release (DR1) of high-resolution optical spectra of 1305 planet hosts. Refined CKS planet radii revealed that small planets are bifurcated into two distinct populations, super-Earths (smaller than 1.5 R ⊕) and sub-Neptunes (between 2.0 and 4.0 R ⊕), with few planets in between (the “radius gap”). Several theoretical models of the radius gap predict variation with stellar mass, but testing these predictions is challenging with… 

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