Thursday, July 25, 2013

1307.6532 (Y. Gómez Maqueo Chew et al.)

Discovery of WASP-65b and WASP-75b: Two Hot Jupiters Without Highly Inflated Radii    [PDF]

Y. Gómez 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, J. Bento, J. Bochinski, V. Burwitz, L. Delrez, B. Enoch, A. Fumel, C. A. Haswell, G. Hébrard, C. Hellier, S. Holmes, E. Jehin, U. Kolb, J. McCormac, G. R. M. Miller, A. J. Norton, F. Pepe, D. Queloz, J. Rodríguez, D. Ségransan, I. Skillen, K. G. Stassun, S. Udry, C. A. Watson
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 of 3 Gyr). The mean density of WASP-65b is similar to that of Jupiter (rho_pl = 1.13 +/- 0.08 rho_J), and in fact, WASP-65b is one of the densest planets with a mass between 0.1 and 2.0 M_J, a mass range in which a large fraction of the known planets have been found to be inflated with respect to theoretical planet models. WASP-65b is one of only a handful of planets with masses of around 1.5 M_J, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of Jupiter-mass WASP-75b is slightly inflated (< 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).
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