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

Hellier; Smalley

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 MJup and an orbital period of ~4.5 days; WASP-114b has a mass of 1.77 MJup 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.

Citation

Hellier, & Smalley. (2016). Discovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201526517

• Acceptance Date: Jul 4, 2016
• Publication Date: Oct 3, 2016
• Journal: Astronomy and Astrophysics
• Print ISSN: 2329-1273
• Publisher: Hans Publishers
• DOI: https://doi.org/10.1051/0004-6361/201526517
• Keywords: planets and satellites: detection; stars: individual:WASP-113; stars:individual:WASP-114; techniques:radial velocities/ techniques:photometric
• Publisher URL: https://doi.org/10.1051/0004-6361/201526517