Volume 559, November 2013
|Number of page(s)||11|
|Section||Planets and planetary systems|
|Published online||01 November 2013|
Discovery of WASP-65b and WASP-75b: Two hot Jupiters without highly inflated radii⋆
1 Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
2 Physics and Astronomy Department, Vanderbilt University, Nashville, Tennessee 37235, USA
3 Centro de Radioastronomía y Astrofísica, UNAM, Apartado Postal 3-72, 58089 Morelia, Michoacán, México
4 School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, UK
5 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
6 Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
7 Université de Liège, Allée du 6 août 17, Sart Tilman, Liège 1, 4000 Liège, Belgium
8 Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
9 Aix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France
10 Department of Physics and Astronomy, Macquarie University, NSW 2109 Sydney, Australia
11 Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 75014 Paris, France
12 Observatoire de Haute-Provence, CNRS/OAMP, 04870 St Michel l’ Observatoire, France
13 Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK
14 Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany
15 Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de Palma, Spain
16 Department of Physics, University of Cambridge, J J Thomson Av, Cambridge, CB3 0HE, UK
17 Observatori Astronòmic de Mallorca, Camí de l’Observatori s/n, 07144 Costitx, Mallorca, Spain
18 Department of Physics, Fisk University, Nashville, Tennessee 37208, USA
19 Astrophysics Research Centre, Queen’s University Belfast, University Road, Belfast BT7 1NN, UK
Received: 18 July 2013
Accepted: 27 September 2013
We report the discovery of two transiting hot Jupiters, WASP-65b (Mpl = 1.55 ± 0.16 MJ; Rpl = 1.11 ± 0.06 RJ), and WASP-75b (Mpl = 1.07 ± 0.05 MJ; Rpl = 1.27 ± 0.05 RJ). They orbit their host star every ~2.311, and ~2.484 days, respectively. The planet host WASP-65 is a G6 star (Teff = 5600 K, [Fe/H] = −0.07 ± 0.07, age ≳8 Gyr); WASP-75 is an F9 star (Teff = 6100 K, [Fe/H] = 0.07 ± 0.09, age ~ 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 MJ (ρpl = 1.13 ± 0.08 ρJ), a mass range where a large fraction of planets are found to be inflated with respect to theoretical planet models. WASP-65b is one of only a handful of planets with masses of ~1.5 MJ, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of WASP-75b is slightly inflated (≲10%) as compared to theoretical planet models with no core, and has a density similar to that of Saturn (ρpl = 0.52 ± 0.06 ρJ).
Key words: planetary systems / stars: individual: WASP-65 / stars: individual: WASP-75
Light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/559/A36
© ESO, 2013
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