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WASP-78b and WASP-79b : two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus
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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, Don, Queloz, D., Ségransan, D., Smith, A. M. S., Southworth, J., Triaud, A. H. M. J., Udry, S. and West, Richard G. (2012) WASP-78b and WASP-79b : two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus. Astronomy & Astrophysics, Volume 547 . Article number A61. doi:10.1051/0004-6361/201219731 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201219731
Abstract
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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | November 2012 | ||||
Dates: |
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Volume: | Volume 547 | ||||
Article Number: | Article number A61 | ||||
DOI: | 10.1051/0004-6361/201219731 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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