Volume 502, Number 1, July IV 2009
|Page(s)||395 - 400|
|Section||Planets and planetary systems|
|Published online||27 May 2009|
The sub-Jupiter mass transiting exoplanet WASP-11b*
Department of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, UK e-mail: firstname.lastname@example.org
2 School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK
3 Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast, BT7 1NN, UK
4 Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de la Palma, Tenerife, Spain
5 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
6 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
7 Institut d'Astrophysique de Paris, CNRS (UMR 7095) – Université Pierre & Marie Curie, 98bis Bvd. Arago, 75014 Paris, France
8 Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France
9 Department of Physics and Astronomy, The Open University, Milton Keynes, MK7 6AA, UK
10 Laboratoire d'Astrophysique de Marseille, OAMP, Université Aix-Marseille & CNRS, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
11 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
12 Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Santa Barbara, CA 93117, USA
Accepted: 20 May 2009
We report the discovery of a sub-Jupiter mass exoplanet transiting a magnitude host star 1SWASP J030928.54+304024.7. A simultaneous fit to the transit photometry and radial-velocity measurements yield a planet mass Mp = 0.53 ± 0.07 , radius and an orbital period of days. The host star is an early to mid-K dwarf, with a spectral analysis yielding an effective temperature of 4800 ± 100 K and log g = 4.45 ± 0.2. It is amongst the smallest, least massive and lowest luminosity stars known to harbour a transiting exoplanet. WASP-11b is the third least strongly irradiated transiting exoplanet discovered to date, experiencing an incident flux Fp = 1.9108 erg s-1 cm-2 and having an equilibrium temperature Teql = 960 ± 70 K.
Key words: stars: individual: WASP-11 / planetary systems / techniques: photometric / techniques: radial velocities / techniques: spectroscopic
© ESO, 2009
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