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

Aims. We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP survey, 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 ∼ 4.1dex. However, WASP-113 is older than WASP-114. Although the planetary companions have similar radii, WASP-114b is almost 4 times heavier than WASP-113b. WASP-113b has a mass of 0.48 MJup and an orbital period of ∼ 4.5 days; WASP-114b has a mass of 1.77 MJupand 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.