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

Y. Gómez Maqueo Chew, F. Faedi, D. Pollacco, David John Alexander 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. BurwitzL. 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. Watson

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Abstract

We report the discovery of two transiting hot Jupiters, WASP-65b (Mpl = 1.55 ± 0.16 MJ; Rpl = 1.11 ± 0.06 RJ), and WASP-75b (Mpl = 1.07 ± 0.05 MJ; Rpl = 1.27 ± 0.05 RJ). They orbit their host star every ~2.311, and ~2.484 days, respectively. The planet host WASP-65 is a G6 star (Teff = 5600 K, [Fe/H] = −0.07 ± 0.07, age ≳8 Gyr); WASP-75 is an F9 star (Teff = 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 MJ (ρpl = 1.13 ± 0.08 ρJ), 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 MJ, 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 (ρpl = 0.52 ± 0.06 ρJ).

Original languageEnglish
Article numberA36
Number of pages11
JournalAstronomy & Astrophysics
Volume559
DOIs
Publication statusPublished - 1 Nov 2013

Keywords

  • Planetary systems
  • Stars: individual: WASP-65
  • Stars: individual: WASP-75

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