On the Tidal Inflation of Short-Period Extrasolar Planets

Details On the Tidal Inflation of Short-Period Extrasolar Planets On the Tidal Inflation of Short-Period Extrasolar Planets

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...548..466b&link_type=abstract

The Astrophysical Journal, Volume 548, Issue 1, pp. 466-472.

Astronomy and Astrophysics

Astronomy

165

Celestial Mechanics, Stellar Dynamics, Stars: Planetary Systems, Solar System: Formation

Scientific paper

We examine the consequences of tidal interaction between eccentric short-period extrasolar planets and their host stars and of secular perturbations between planets in a given system. If the planet is within 0.05 AU of the star, the dissipation of the stellar tidal disturbance within the planet provides a significant energy source, which causes the planet to inflate as it adjusts to a thermal equilibrium. We determine the planetary size as a function of the tidal dissipation rate with or without the presence of a core. Inflation intensifies the star-planet tidal interaction and accelerates the pace of the planet's spin synchronization and orbital circularization. We apply our results to three systems with short-period planets: HD 209458, Ups And, and Tau Boo. University of California Observatories, Lick Observatory Bulletin, No. 139P.

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