[en] We report on four new transiting hot Jupiters discovered by the WASP- South survey. WASP-178b transits a V = 9.9, A1V star with T[SUB]eff[/SUB] = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 R[SUB]Jup[/SUB], in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 ± 60 K, the planet is one of the best targets for studying ultrahot Jupiters that is visible from the Southern hemisphere. The three host stars WASP-184, WASP-185, and WASP-192 are all post-main-sequence G0 stars of ages 4-8 Gyr. The larger stellar radii (1.3-1.7 M[SUB]☉[/SUB]) mean that the transits are relatively shallow (0.7-0.9 per cent) even though the planets have moderately inflated radii of 1.2-1.3 R[SUB]Jup[/SUB]. WASP-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from WASP-185 and 4.4 mag fainter might be physically associated.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hellier, Coel; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
Anderson, D. R.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK ; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Barkaoui, Khalid ; Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco ; Astrobiology Research Unit, Université de Liège, Liège 1, Belgium
Benkhaldoun, Z.; Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco
Bouchy, F.; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
Burdanov, Artem ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Cameron, A. Collier; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Nielsen, L. D.; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
Maxted, P. F. L.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
Pepe, F.; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
Pollacco, D.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Pozuelos Romero, Francisco José ; Astrobiology Research Unit, Université de Liège, Liège 1, Belgium ; Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Liège 1, Belgium
Ségransan, D.; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
Smalley, B.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
Triaud, A. H. M. J.; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Turner, O. D.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK ; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
Udry, S.; Observatoire astronomique de l'Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
West, R. G.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK)
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