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

TL;DR

This paper reports the discovery and detailed characterization of two inflated hot-Jupiters, WASP-113b and WASP-114b, highlighting their contrasting densities and potential for atmospheric studies.

Contribution

It presents the first discovery and analysis of two similar host stars with two different hot-Jupiters, emphasizing differences in planetary mass, density, and atmospheric observability.

Findings

WASP-113b has a radius anomaly of 0.35 and high scale height (~950 km).

WASP-114b is nearly four times more massive than WASP-113b.

Both planets are inflated, with similar radii but 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 $T_{\rm eff}$ $\sim 4.1$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 $0.48\,$ $\mathrm{M}_{\rm Jup}$ and an orbital period of $\sim 4.5\,$days; WASP-114b has a mass of $1.77\,$ $\mathrm{M}_{\rm Jup}$ 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.