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

S. C. C. Barros (1) , D. J. A. Brown , G. Hébrard (2) , Y. Gomez Maqueo Chew , D. R. Anderson , P. Boumis , L. Delrez , K. L. Hay , K. W. F. Lam , J. Llama , M. Lendl , J. Mccormac , B. Skiff , B. Smalley , O. Turner , M. Vanhuysse , D. J. Armstrong , I. Boisse (3) , F. Bouchy (4, 2) , A. Collier Cameron (5) , F. Faedi , M. Gillon (6) , C. Hellier , E. Jehin (6) , A. Liakos (7) , J. Meaburn , H. P. Osborn , F. Pepe (8) , I. Plauchu-Frayn , D. Pollacco , D. Queloz (8) , J. Rey (9) , J. Spake , D. Segransan (8) , A. H. M. Triaud , S. Udry (8) , S. R. Walker , C. A. Watson , R. G. West , P. J. Wheatley

1 Virologia
2 IAP - Institut d'Astrophysique de Paris
3 LAM - Laboratoire d'Astrophysique de Marseille
4 OHP - Observatoire de Haute-Provence
5 University of St Andrews [Scotland]
6 Institut d'Astrophysique et de Géophysique [Liège]
7 Department of Astrophysics, Astronomy and Mechanics [Kapodistrian Univ]
8 ObsGE - Observatoire Astronomique de l'Université de Genève
9 DRCP - Département RadioChimie et Procédés

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 similar to 5900 K, [Fe/H] similar to 0.12, and log g similar to 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 similar to 4.5 days; WASP-114b has a mass of 1.77 M-Jup and an orbital period of similar to 1.5 days. Both planets have inflated radii, in particular WASP-113 with a radius anomaly of R = 0.35. The high scale height ofWASP-113b (similar to 950 km) makes it a good target for follow-up atmospheric observations.

Domaines: Astrophysique [astro-ph]; Planète et Univers [physics]

S. C. C. Barros, D. J. A. Brown, G. Hébrard, Y. Gomez Maqueo Chew, D. R. Anderson, et al.. WASP-113b and WASP-114b, two inflated hot Jupiters with contrasting densities. Astronomy and Astrophysics - A&A, 2016, 593, ⟨10.1051/0004-6361/201526517⟩. ⟨hal-01441173⟩