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arXiv · 1307.6532

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

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·P. F. L. Maxted·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
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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 of 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 M_J (rho_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 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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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, P. F. L. Maxted, 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. 2013-07-24. Discovery of WASP-65b and WASP-75b: Two Hot Jupiters Without Highly Inflated Radii. https://doi.org/10.1051/0004-6361/201322314

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