WASP-113b and WASP-114b, two inflated hot Jupiters with contrasting densities

¹ Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
e-mail: susana.barros@astro.up.pt
² Aix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France
³ Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
⁴ Institut d’Astrophysique de Paris, UMR 7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014 Paris, France
⁵ Observatoire de Haute-Provence, Université d’Aix-Marseille & CNRS, 04870 Saint-Michel l’ Observatoire, France
⁶ Instituto de Astronomía, Universidad Nacional Autónoma de México, 04510 Ciudad Universitaria, Mexico
⁷ Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
⁸ Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, 15236 Penteli, Greece
⁹ Institut d’Astrophysique et de Geophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C, Liège 1, Belgium
¹⁰ SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK
¹¹ Lowell Observatory, 1400 W Mars Hill Rd. Flagstaff, AZ 86001, USA
¹² Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
¹³ OverSky, 47 allée des Palanques, BP 12, 33127 Saint-Jean d’Illac, France
¹⁴ Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Rd., Manchester, M13 9PL, UK
¹⁵ Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
¹⁶ Instituto de Astronomía, Universidad Nacional Autónoma de México, 22860 Ensenada, Baja California, Mexico
¹⁷ Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK
¹⁸ Centre for Planetary Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada
¹⁹ Department of Astronomy & Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada
²⁰ Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
²¹ Astrophysics Research Centre, School of Mathematics & Physics, Queen’s University Belfast, University Road, Belfast, BT7 1NN, UK

Received: 12 May 2015
Accepted: 4 July 2016

Abstract

Aims. We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP surveys, SOPHIE and CORALIE.

Methods. The planetary nature of the systems was established by performing follow-up photometric and spectroscopic observations. The follow-up data were combined with the WASP-photometry and analysed with an MCMC code to obtain system parameters.

Results. The host stars WASP-113 and WASP-114 are very similar. They are both early G-type stars with an effective temperature of ~5900 K, [Fe/H] ~ 0.12, and log g~ 4.1 dex. However, WASP-113 is older than WASP-114. Although the planetary companions have similar radii, WASP-114b is almost four times heavier than WASP-113b. WASP-113b has a mass of 0.48 M_Jup and an orbital period of ~4.5 days; WASP-114b has a mass of 1.77 M_Jup and an orbital period of ~1.5 days. Both planets have inflated radii, in particular WASP-113 with a radius anomaly of ℜ = 0.35. The high scale height of WASP-113b (~950 km) makes it a good target for follow-up atmospheric observations.