A Distinct Population of Small Planets: Sub-Earths

  title={A Distinct Population of Small Planets: Sub-Earths},
  author={Yansong 岩松 Qian 钱 and Yan-Qing 燕庆 Wu 武},
  journal={The Astronomical Journal},
The sizes of small planets are known to be bimodal, with a gap separating planets that have lost their primordial atmospheres (super-Earths) and the ones that retain them (mini-Neptunes). Here, we report evidence for another distinct population at smaller sizes. By focusing on planets orbiting around GK dwarfs inward of 16 days and correcting for observational completeness, we find that the number of super-Earths peaks around 1.4 Earth radii and disappears shortly below this size. Instead, a… 
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