[en] We report the discovery of three new transiting hot Jupiters by WASP-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph. WASP-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to southern telescopes. It is a 0.95M[SUB]Jup[/SUB] planet with a moderately bloated radius of 1.5 {R}[SUB]{Jup[/SUB]} in a 2 day orbit around a slightly evolved F9 star. WASP-83b is a Saturn-mass planet at 0.3 {M}[SUB]{Jup[/SUB]} with a radius of 1.0 {R}[SUB]{Jup[/SUB]}. It is in a 5 day orbit around a fainter (V = 12.9) G8 star. WASP-89b is a 6 M[SUB]Jup[/SUB] planet in a 3 day orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas WASP-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 days, while star spots are visible in the transits. There are indications that the planet’s orbit is aligned with the stellar spin. WASP-89 is a good target for an extensive study of transits of star spots.
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
Collier Cameron, A.; SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
Delrez, Laetitia ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Gillon, Michaël ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jehin, Emmanuel ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Lendl, Monika ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Maxted, P. F. L.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Pepe, F.; Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
Pollacco, D.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Queloz, D.; Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland ; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK
Ségransan, D.; Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
Smalley, B.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Smith, A. M. S.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK ; N. Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
Southworth, J.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Triaud, A. H. M. J.; Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland ; Department of Physics and Kavli Institute for Astrophysics & Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Turner, O. D.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Udry, S.; Observatoire astronomique de l’Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
West, R. G.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK)
