THREE WASP-SOUTH TRANSITING EXOPLANETS: WASP-74b, WASP-83b, AND WASP-89b

• Main Authors: Hellier, Coel (Author), Anderson, D. R. (Author), Collier Cameron, A. (Author), Delrez, L. (Author), Gillon, M. (Author), Jehin, Emmanuel (Author), Lendl, M. (Author), Maxted, Pierre F. L. (Author), Pepe, F. (Author), Pollacco, D. (Author), Queloz, D. (Author), Smalley, B. (Author), Smith, A. M. S. (Author), Southworth, J. (Author), Turner, O. D. (Author), Udry, S. (Author), West, R. G. (Author), Triaud, Amaury (Contributor), Segransan, D. (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor)
• Format: Article
• Language: English
• Published: IOP Publishing, 2015-09-01T19:11:07Z.
• Subjects: Article
• Online Access: Get fulltext

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[subscript Jup] planet with a moderately bloated radius of 1.5 R[subscript Jup] in a 2 day orbit around a slightly evolved F9 star. WASP-83b is a Saturn-mass planet at 0.3 M[subscript Jup] with a radius of 1.0 R[subscript Jup]. It is in a 5 day orbit around a fainter (V = 12.9) G8 star. WASP-89b is a 6 M[subscript Jup] 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.
Swiss National Science Foundation (Fellowship Grant P300P2-147773)