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

S. C. C. Barros, D. J. A. Brown, G. Hébrard, Y. Gómez 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, F. Bouchy, A. Collier Cameron, F. Faedi, M. Gillon, C. Hellier, E. Jehin, A. Liakos, J. Meaburn, H. P. Osborn, F. Pepe, I. Plauchu-Frayn, D. Pollacco, D. Queloz, J. Rey, J. Spake, D. Segransan, A. H. M. J. Triaud, S. Udry, S. R. Walker, C. A. Watson, R. G. West, P. J. Wheatley

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.

planets and satellites: detection, stars: individual: WASP-113, stars: individual: WASP-114, techniques: radial velocities, techniques: photometric

Astronomy & Astrophysics
Volume 593, Article Number A113, Number of pages 9
2016 September

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia