Volume 547, November 2012
|Number of page(s)||7|
|Section||Planets and planetary systems|
|Published online||29 October 2012|
WASP-78b and WASP-79b: two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus⋆,⋆⋆
Astrophysics Group, Keele University,
2 SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
3 Université de Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium
4 Observatoire de Genève, Université de Genève, Chemin des maillettes 51, 1290 Sauverny, Switzerland
5 Astrophysics Research Centre, School of Mathematics & Physics, Queen’s University Belfast, University Road, Belfast BT7 1NN, UK
6 Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
Received: 1 June 2012
Accepted: 28 September 2012
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.
Key words: planets and satellites: general / stars: individual: WASP-78 / stars: individual: WASP-79 / techniques: spectroscopic / techniques: radial velocities / techniques: photometric
Photometric data is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/547/A61
Table 1 is available in electronic form at http://www.aanda.org
© ESO, 2012
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