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Abstract: The distribution of the orbits of close-in exoplanets shows evidence foron-going removal and destruction by tides. Tides raised on a planet-s host starcause the planet-s orbit to decay, even after the orbital eccentricity hasdropped to zero. Comparison of the observed orbital distribution andpredictions of tidal theory show good qualitative agreement, suggesting tidaldestruction of close-in exoplanets is common. The process can explain theobserved cut-off in small a-values, the clustering of orbital periods nearthree days, and the relative youth of transiting planets. Contrary to previousconsiderations, a mechanism to stop the inward migration of close-in planets attheir current orbits is not necessarily required. Planets nearing tidaldestruction may be found with extremely small a, possibly already stripped ofany gaseous envelope. The recently discovered CoRoT-Exo-7 b may be an exampleof such a planet and will probably be destroyed by tides within the next fewGyrs. Also, where one or more planets have already been accreted, a star mayexhibit an unusual composition and-or spin rate.



Author: Brian Jackson, Rory Barnes, Richard Greenberg

Source: https://arxiv.org/



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