WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus
Smalley, B. · Anderson, D. R. · Collier-Cameron, A. · Doyle, A. P. · Fumel, A. · Gillon, M. · Hellier, C. · Jehin, E. · Lendl, M. · Maxted, P. F. L. · Pepe, F. · Pollacco, D. · Queloz, D. · Segransan, D. · Smith, A. M. S. · Southworth, J. · Triaud, A. H. M. J. · Udry, S. · West, R. G.
Original · EN
We report the discovery of WASP-78b and WASP-79b, two highly-bloated Jupiter-mass exoplanets orbiting F-type host stars. WASP-78b orbits its V=12.0 host star (TYC 5889-271-1) every 2.175 days and WASP-79b orbits its V=10.1 host star (CD-30 1812) every 3.662 days. Planetary parameters have been determined using a simultaneous fit to WASP and TRAPPIST transit photometry and CORALIE radial-velocity measurements. For WASP-78b a planetary mass of 0.89 +/- 0.08 Mⱼup and a radius of 1.70 +/- 0.11 Rⱼup is found. The planetary equilibrium temperature of Tₚ = 2350 +/- 80 K for WASP-78b makes it one of the hottest of the currently known exoplanets. WASP-79b its found to have a planetary mass of 0.90 +/- 0.08 Mⱼup, but with a somewhat uncertain radius due to lack of sufficient TRAPPIST photometry. The planetary radius is at least 1.70 +/- 0.11 Rⱼup, but could be as large as 2.09 +/- 0.14 Rⱼup, which would make WASP-79b the largest known exoplanet.
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