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The class of exotic Jupiter-mass planets that orbit very close to theirparent stars were not explicitly expected before their discovery. The recentlyfound transiting planet WASP-12b has a mass Mp = 1.4(+/-0.1) Jupiter masses(MJ), a mean orbital distance of only 3.1 stellar radii (meaning it is subjectto intense tidal forces), and a period of 1.1 days. Its radius 1.79(+/- 0.09)RJ is unexpectedly large and its orbital eccentricity 0.049(+/-0:015) is evenmore surprising as such close orbits are in general quickly circularized. Herewe report an analysis of its properties, which reveals that the planet islosing mass to its host star at a rate ~ 10^-7 MJ yr^-1. The planets surface isdistorted by the stars gravity and the light curve produced by its prolateshape will differ by about ten per cent from that of a spherical planet. Weconclude that dissipation of the stars tidal perturbation in the planetsconvective envelope provides the energy source for its large volume. We predictup to 10mJy CO band-head (2.292 micron) emission from a tenuous disk around thehost star, made up of tidally stripped planetary gas. It may also contain adetectable resonant super-Earth, as a hypothetical perturber that continuallystirs up WASP-12b's eccentricity.

WASP-12b as a prolate, inflated and disrupting planet from tidal dissipation