Discovery of WASP-65b and WASP-75b : two hot Jupiters without highly inflated radii
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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).
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 , J , 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 & Watson , C 2013 , ' Discovery of WASP-65b and WASP-75b : two hot Jupiters without highly inflated radii ' Astronomy & Astrophysics , vol 559 , A36 . DOI: 10.1051/0004-6361/201322314
Astronomy & Astrophysics
© ESO, 2013. Reproduced with permission from Astronomy & Astrophysics, © ESO
Y. Gómez Maqueo Chew acknowledges postdoctoral funding support from the Vanderbilt Office of the Provost, through the Vanderbilt Initiative in Data-intensive Astrophysics (VIDA) and through a grant from the Vanderbilt International Office in support of the Vanderbilt-Warwick Exoplanets Collaboration. L. Delrez is a FRIA Ph.D. student of the FNRS. The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement number RG226604 (OPTICON). C. Liebig acknowledges the Qatar Foundation for support from QNRF grant NPRP-09-476-1-078. A.H.M.J. Triaud is a Swiss National Science Foundation fellow under grant number PBGEP2-145594.
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