publication . Preprint . 2018

Survival Function Analysis of Planet Size Distribution

Zeng, Li; Jacobsen, Stein B.; Sasselov, Dimitar D.; Vanderburg, Andrew;
Open Access English
  • Published: 11 Jan 2018
Abstract
Applying the survival function analysis to the planet radius distribution of the Kepler exoplanet candidates, we have identified two natural divisions of planet radius at 4 Earth radii and 10 Earth radii. These divisions place constraints on planet formation and interior structure model. The division at 4 Earth radii separates small exoplanets from large exoplanets above. When combined with the recently-discovered radius gap at 2 Earth radii, it supports the treatment of planets 2-4 Earth radii as a separate group, likely water worlds. Thus, for planets around solar-type FGK main-sequence stars, we argue that 2 Earth radii is the separation between water-poor an...
Subjects
arXiv: Astrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsPhysics::GeophysicsPhysics::Space Physics
free text keywords: Astrophysics - Earth and Planetary Astrophysics
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