Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b

Hellier, Coel; Anderson, D.R.; Collier Cameron, A.; Delrez, L.; Gillon, M.; Jehin, E.; Lendl, M.; Maxted, Pierre; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, Barry; Smith, A.M.S.; Southworth, John; Triaud, A.H.M.J.; Turner, O.D.; Udry, S.; West, R.G.

Abstract

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 0.95 M_Jup planet with a moderately bloated radius of 1.5 R_Jup in a 2-d orbit around a slightly evolved F9 star. WASP-83b is a Saturn-mass planet at 0.3 M_Jup with a radius of 1.0 R_Jup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star. WASP-89b is a 6 M_Jup planet in a 3-d 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 d, 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.

Citation

Hellier, C., Anderson, D., Collier Cameron, A., Delrez, L., Gillon, M., Jehin, E., …West, R. (2014). Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b. Astronomical Journal, 150(1), Article 18. https://doi.org/10.1088/0004-6256/150/1/18

• Journal Article Type: Article
• Acceptance Date: May 7, 2015
• Online Publication Date: Jun 24, 2015
• Publication Date: Oct 23, 2014
• Journal: Astronomical Journal
• Print ISSN: 0004-6256
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 150
• Issue: 1
• Article Number: 18
• DOI: https://doi.org/10.1088/0004-6256/150/1/18
• Keywords: astrophysics; planetary systems; stars; WASP74; WASP83; WASP89
• Publisher URL: http://arxiv.org/abs/1410.6358v2