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

J. Rodriguez , D. Segransan , I. Skillen , K. G. Stassun , S. Udry , C. Watson , Y. Gomez Maqueo Chew , F. Faedi , D. Pollacco , D. J. A. Brown , A. P. Doyle , A. Collier Cameron , M. Gillon , M. Lendl , B. Smalley , A. H. M. J. Triaud , R. G. West , P. J. Wheatley , R. Busuttil , C. Liebig , D. R. Anderson , D. J. Armstrong , S. C. C. Barros (1) , J. Bento , J. Bochinski , V. Burwitz , L. Delrez , B. Enoch , A. Fumel , C. A. Haswell , G. Hebrard , C. Hellier , S. Holmes , E. Jehin , U. Kolb , P. F. L. Maxted , J. Mccormac , G. R. M. Miller , A. J. Norton , F. Pepe , D. Queloz

1 LAM - Laboratoire d'Astrophysique de Marseille

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 similar to 2.311, and similar to 2.484 days, respectively. The planet host WASP-65 is a G6 star (T-eff = 5600 K, [Fe/H] = -0.07 +/- 0.07, age greater than or similar to 8 Gyr); WASP-75 is an F9 star (T-eff = 6100 K, [Fe/H] = 0.07 +/- 0.09, age similar to 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 M-j (p(pl) = 1.13 +/- 0.08 rho(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 similar to 1.5 M-j, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of WASP-75b is slightly inflated (less than or similar to 10%) as compared to theoretical planet models with no core, and has a density similar to that of Saturn (rho(pl) = 0.52 +/- 0.06 rho(j)).

Domaines: Astrophysique [astro-ph]

J. Rodriguez, D. Segransan, I. Skillen, K. G. Stassun, S. Udry, et al.. Discovery of WASP-65b and WASP-75b: Two hot Jupiters without highly inflated radii. Astronomy and Astrophysics - A&A, 2013, 559, ⟨10.1051/0004-6361/201322314⟩. ⟨hal-01439551⟩