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We investigate the possibility of substantial inflation of short-periodJupiter-mass planets, as a result of their internal tidal dissipationassociated with the synchronization and circularization of their orbits. Weemploy the simplest prescription based on an equilibrium model with a constantlag angle for all components of the tide. We show that for young Jupiter-massplanets, with a period less than 3 days, an initial radius about 2 Jupiterradii, and an orbital eccentricity greater than 0.2, the energy dissipatedduring the circularization of their orbits is sufficiently intense andprotracted to inflate their sizes up to their Roche radii

The Effect of Tidal Inflation Instability on the Mass and Dynamical Evolution of Extrasolar Planets with Ultrashort Periods