Photoevaporation and high-eccentricity migration created the sub-Jovian desert

By J. Owen, D. Lai. Monthly notices of the Royal Astronomical Society, 2018

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The mass-period or radius-period distribution of close-in exoplanets shows a paucity of intermediate mass/size (sub-Jovian) planets with periods ~< 3 days. We show that this sub-Jovian desert can be explained by the photoevaporation of highly irradiated sub-Neptunes and the tidal disruption barrier for gas giants undergoing high-eccentricity migration. The distinctive triangular shape of the sub-Jovain desert result from the fact that photoevaporation is more effective closer to the host star, and that in order for a gas giant to tidally circularise closer to the star without tidal disruption it needs to be more massive. Our work indicates that super-Earths/mini-Neptunes and hot-Jupiters had distinctly separate formation channels and arrived at their present locations at different times.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/c4a16b3484e70e9ee4d3e493ac72ed308934d129