1 Observatoire de Genève, Université de Genève, Chemin des maillettes 51, 1290 Sauverny, Switzerland
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 Université de Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium
5 Las Cumbres Observatory, 6740 Cortona Drive Suite 102, Goleta, CA 93117, USA
6 Astrophysics Research Centre, School of Mathematics & Physics, Queen’s University, University Road, Belfast BT7 1NN, UK
7 Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
8 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Received: 11 May 2012
Accepted: 29 June 2012
We report the discovery of two new transiting planets from the WASP survey. WASP-42 b is a 0.500 ± 0.035 MJ planet orbiting a K1 star at a separation of 0.0548 ± 0.0017 AU with a period of 4.9816872 ± 7.3 × 10-6 days. The radius of WASP-42 b is 1.080 ± 0.057 RJ while its equilibrium temperature is Teq = 995 ± 34 K. We detect some evidence for a small but non-zero eccentricity of e = 0.060 ± 0.013. WASP-49 b is a 0.378 ± 0.027 MJ planet around an old G6 star. It has a period of 2.7817387 ± 5.6 × 10-6 days and a separation of 0.0379 ± 0.0011 AU. This planet is slightly bloated, having a radius of 1.115 ± 0.047 RJ and an equilibrium temperature of Teq = 1369 ± 39 K. Both planets have been followed up photometrically, and in total we have obtained 5 full and one partial transit light curves of WASP-42 and 4 full and one partial light curves of WASP-49 using the Euler-Swiss, TRAPPIST and Faulkes South telescopes.
Key words: planetary systems / methods: observational / techniques: photometric / techniques: spectroscopic / stars: individual: WASP-42 / stars: individual: WASP-49
Based on photometric observations made with WASP-South, EulerCam on the Euler-Swiss telescope, the Belgian TRAPPIST telescope, the Faulkes South Telescope and spectroscopic observations obtained with CORALIE on the Euler-Swiss telescope and HARPS on the ESO 3.6 m telescope (Prog. ID: 087.C-0649).
The photometric time series and radial velocity data in this work are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/544/A72
© ESO, 2012