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

Abstract

We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP survey, {\it SOPHIE} and {\it CORALIE}. 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. The host stars WASP-113 and WASP-114 are very similar. They are both early G-type stars with an effective temperature of $\sim 5900$K, [Fe/H]$\sim 0.12$ and $T_{\mathrm{eff}}$ $\sim 4.1$dex. 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 $0.48$ ${\mathrm{M}}_{\mathrm{Jup}}$ and an orbital period of $\sim 4.5$days; WASP-114b has a mass of $1.77$ ${\mathrm{M}}_{\mathrm{Jup}}$ and an orbital period of $\sim 1.5$days. Both planets have inflated radii, in particular WASP-113 with a radius anomaly of $\Re =0.35$. The high scale height of WASP-113b ($\sim 950$ km ) makes it a good target for follow-up atmospheric observations.

9 pages, 6 figures, 5 tables, accepted for publication in A&A