Why is there a Dearth of Close-In Planets around Fast-Rotating stars?

Abstract

We propose that the reported dearth of $Kepler$ Objects of Interest (KOIs) with orbital periods $P_{\mathrm{orb}}\lesssim 2-3$days around stars with rotation periods $P_{\mathrm{rot}}\lesssim 5-10$days can be attributed to tidal ingestion of close-in planets by their host stars. We show that the planet distribution in this region of the $\log P_{\mathrm{orb}}-\log P_{\mathrm{rot}}$ plane is qualitatively reproduced with a model that incorporates tidal interaction and magnetic braking as well as the dependence on the stellar core--envelope coupling timescale. We demonstrate the consistency of this scenario with the inferred break in the $P_{\mathrm{orb}}$ distribution of close-in KOIs and point out a potentially testable prediction of this interpretation.

8 pages, 3 figures, accepted for publication in The Astrophysical Journal

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