3 years ago

Survival Function Analysis of Planet Size Distribution.

Stein B. Jacobsen, Dimitar D. Sasselov, Andrew Vanderburg, Li Zeng

Applying survival function analysis to the planet radius distribution from the Kepler sample, 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 R separates small exoplanets from the ones 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 and water-rich planets, and 4 Earth radii is the separation between gas-poor and gas-rich planets, and we propose the following classification scheme: (<2 Earth radii) rocky planets, (2-4 Earth radii) water worlds, (4-10 Earth radii) transitional planets, and (>10 Earth radii) gas giants.

Publisher URL: http://arxiv.org/abs/1801.03993

DOI: arXiv:1801.03993v1

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