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

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, Jakub; 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. and Watson, C. (2013). Discovery of WASP-65b and WASP-75b: two hot Jupiters without highly inflated radii. Astronomy & Astrophysics, 559, article no. A36.

DOI: https://doi.org/10.1051/0004-6361/201322314

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 ~ 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 (M_J (ρ_pl = 1.13 ± 0.08 ρ_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 ~1.5 (M_J, 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 (ρ_pl = 0.52 ± 0.06 ρ_J).

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• Item ORO ID
• 38973
• Item Type
• Journal Item
• ISSN
• 1432-0746
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	Consortium Universitites
  Not Set	Not Set	STFC (Science & Technology Facilities Council)
  Not Set	FRFC 2.5.594.09.F	Belgian Fund for Scientific Research (Fond National de la RechercheScientifique, FNRS)
  Not Set	Not Set	Swiss National Science Fundation (SNF)
  Not Set	RG226604 (OPTICON)	European Community’sSeventh Framework Programme (FP7/2007-2013)
  Not Set	NPRP-09-476-1-078	Qatar Foundation
  Not Set	Not Set	Vanderbilt Office of the Provost, through the Vanderbilt Initiative in Data-intensive Astrophysics (VIDA
  Not Set	Not Set	Vanderbilt International Office

• Keywords
• planetary systems; stars: individual: (WASP-65, WASP-75; techniques: radial velocity, photometry
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2013 ESO
• Depositing User
• Andrew Norton