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We report the discovery of WASP-103b, a new ultra-short-period planet (P=22.2hr) 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 moremassive (1.49+-0.09 Mjup) and larger (1.53-0.07+0.05 Rjup) than Jupiter. Itslarge size and extreme irradiation (around 9 10^9 erg/s/cm^2) make it anexquisite target for a thorough atmospheric characterization with existingfacilities. Furthermore, its orbital distance is less than 20% larger than itsRoche radius, meaning that it might be significantly distorted by tides andmight experience mass loss through Roche-lobe overflow. It thus represents anew key object for understanding the last stage of the tidal evolution of hotJupiters.

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