%0 Journal Article %T WASP-103b: a new planet at the edge of tidal disruption %A M. Gillon %A D. R. Anderson %A A. Collier-Cameron %A L. Delrez %A C. Hellier %A E. Jehin %A M. Lendl %A P. F. L. Maxted %A F. Pepe %A D. Pollacco %A D. Queloz %A D. Segransan %A A. M. S. Smith %A B. Smalley %A J. Southworth %A A. H. M. J. Triaud %A S. Udry %A V. Van Grootel %A R. G. West %J Physics %D 2014 %I arXiv %R 10.1051/0004-6361/201323014 %X 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. %U http://arxiv.org/abs/1401.2784v1