Discovery of WASP-65b and WASP-75b: two hot Jupiters without highly inflated radii

Gómez Maqueo Chew, Y.; Faedi, F.; Pollacco, D.; Brown, D. J. A.; Doyle, A. P.; Collier Cameron, A.; Gillon, M.; Lendl, M.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Wheatley, P. J.; Busuttil, R.; Liebig, C.; Anderson, D. R.; Armstrong, D. J.; Barros, S. C. C.; Bento, J.; Bochinski, Jakub; Burwitz, V.; Delrez, L.; Enoch, B.; Fumel, A.; Haswell, C. A.; Hébrard, G.; Hellier, C.; Holmes, S.; Jehin, E.; Kolb, U.; Maxted, P. F. L.; McCormac, J.; Miller, G. R. M.; Norton, A. J.; Pepe, F.; Queloz, D.; Rodríguez, J.; Ségransan, D.; Skillen, I.; Stassun, K. G.; Udry, S. and Watson, C. (2013). Discovery of WASP-65b and WASP-75b: two hot Jupiters without highly inflated radii. Astronomy & Astrophysics, 559, article no. A36.

DOI: https://doi.org/10.1051/0004-6361/201322314

Abstract

We report the discovery of two transiting hot Jupiters, WASP-65b (M_pl = 1.55 ± 0.16 (M_J; R_pl = 1.11 ± 0.06 R_J), and WASP-75b ((M_pl = 1.07 ± 0.05 (M_J; R_pl = 1.27 ± 0.05 R_J). They orbit their host star every ~2.311, and ~2.484 days, respectively. The planet host WASP-65 is a G6 star (T_eff = 5600 K, [Fe/H] = -0.07 ± 0.07, age ≳8 Gyr); WASP-75 is an F9 star (T_eff = 6100 K, [Fe/H] = 0.07 ± 0.09, age ~ 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 (M_J (ρ_pl = 1.13 ± 0.08 ρ_J), a mass range where a large fraction of planets are found to be inflated with respect to theoretical planet models. WASP-65b is one of only a handful of planets with masses of ~1.5 (M_J, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of WASP-75b is slightly inflated (≲10%) as compared to theoretical planet models with no core, and has a density similar to that of Saturn (ρ_pl = 0.52 ± 0.06 ρ_J).

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