Volume 552, April 2013
|Number of page(s)||13|
|Section||Planets and planetary systems|
|Published online||29 March 2013|
WASP-64 b and WASP-72 b: two new transiting highly irradiated giant planets⋆
1 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium
2 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
3 School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
4 Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
5 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
6 Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
Received: 15 October 2012
Accepted: 11 February 2013
We report the discovery by the WASP transit survey of two new highly irradiated giant planets. WASP-64 b is slightly more massive (1.271 ± 0.068 MJup) and larger (1.271 ± 0.039 RJup) than Jupiter, and is in very-short (a = 0.02648 ± 0.00024 AU, P = 1.5732918 ± 0.0000015 days) circular orbit around a V = 12.3 G7-type dwarf (1.004 ± 0.028 M⊙, 1.058 ± 0.025 R⊙, Teff = 5500 ± 150 K). Its size is typical of hot Jupiters with similar masses. WASP-72 b has also a mass a bit higher than Jupiter’s (1.461-0.056+0.059 MJup) and orbits very close (0.03708 ± 0.00050 AU, P = 2.2167421 ± 0.0000081 days) to a bright (V = 9.6) and moderately evolved F7-type star (1.386 ± 0.055 M⊙, 1.98 ± 0.24 R⊙, Teff = 6250 ± 100 K). Despite its extreme irradiation (~5.5 × 109 erg s-1 cm-2), WASP-72 b has a moderate size (1.27 ± 0.20 RJup) that could suggest a significant enrichment in heavy elements. Nevertheless, the errors on its physical parameters are still too high to draw any strong inference on its internal structure or its possible peculiarity.
Key words: planetary systems / stars: individual: WASP-64 / techniques: photometric / techniques: radial velocities / techniques: spectroscopic / stars: individual: WASP-72
The photometric time-series used in this work are 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/552/A82
© ESO, 2013
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