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 (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).

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About

  • Item ORO ID
  • 38973
  • Item Type
  • Journal Item
  • ISSN
  • 1432-0746
  • Project Funding Details
  • Funded Project NameProject IDFunding Body
    Not SetNot SetConsortium Universitites
    Not SetNot SetSTFC (Science & Technology Facilities Council)
    Not SetFRFC 2.5.594.09.FBelgian Fund for Scientific Research (Fond National de la RechercheScientifique, FNRS)
    Not SetNot SetSwiss National Science Fundation (SNF)
    Not SetRG226604 (OPTICON)European Community’sSeventh Framework Programme (FP7/2007-2013)
    Not SetNPRP-09-476-1-078Qatar Foundation
    Not SetNot SetVanderbilt Office of the Provost, through the Vanderbilt Initiative in Data-intensive Astrophysics (VIDA
    Not SetNot SetVanderbilt 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

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