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Title:
On the Tidal Inflation of Short-Period Extrasolar Planets
Authors:
Bodenheimer, Peter; Lin, D. N. C.; Mardling, R. A.
Affiliation:
AA(; UCO/Lick Observatory, University of California, Santa Cruz, CA 95064; , .), AB(; UCO/Lick Observatory, University of California, Santa Cruz, CA 95064; , .), AC(; UCO/Lick Observatory, University of California, Santa Cruz, CA 95064; , .; Department of Mathematics, Monash University, Melbourne, Australia; .)
Publication:
The Astrophysical Journal, Volume 548, Issue 1, pp. 466-472. (ApJ Homepage)
Publication Date:
02/2001
Origin:
UCP
ApJ Keywords:
Celestial Mechanics, Stellar Dynamics, Stars: Planetary Systems, Solar System: Formation
DOI:
10.1086/318667
Bibliographic Code:
2001ApJ...548..466B

Abstract

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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