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WASP-103b: a new planet at the edge of tidal disruption

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arxiv 1401.2784 v1 pith:MGQVLU7W submitted 2014-01-13 astro-ph.EP

WASP-103b: a new planet at the edge of tidal disruption

M. Gillon , D. R. Anderson , A. Collier-Cameron , L. Delrez , C. Hellier , E. Jehin , M. Lendl , P. F. L. Maxted
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F. Pepe D. Pollacco D. Queloz D. Segransan A. M. S. Smith B. Smalley J. Southworth A. H. M. J. Triaud S. Udry V. Van Grootel R. G. West
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keywords wasp-103blargermightplanetsignificantlytidalaroundatmospheric
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We report the discovery of WASP-103b, a new ultra-short-period planet (P=22.2 hr) transiting a 12.1 V-magnitude F8-type main-sequence star (1.22+-0.04 Msun, 1.44-0.03+0.05 Rsun, Teff = 6110+-160 K). WASP-103b is significantly more massive (1.49+-0.09 Mjup) and larger (1.53-0.07+0.05 Rjup) than Jupiter. Its large size and extreme irradiation (around 9 10^9 erg/s/cm^2) make it an exquisite target for a thorough atmospheric characterization with existing facilities. Furthermore, its orbital distance is less than 20% larger than its Roche radius, meaning that it might be significantly distorted by tides and might experience mass loss through Roche-lobe overflow. It thus represents a new key object for understanding the last stage of the tidal evolution of hot Jupiters.

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