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25 April 2024

» arxiv » 1410.6358

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Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b
Coel Hellier ; D.R. Anderson ; A. Collier Cameron ; L. Delrez ; M. Gillon ; E. Jehin ; M. Lendl ; P.F.L. Maxted ; F. Pepe ; D. Pollacco ; D. Queloz ; D. Segransan ; B. Smalley ; A.M.S. Smith ; J. Southworth ; A.H.M.J. Triaud ; O.D. Turner ; S. Udry ; R.G. West ;
Date:	23 Oct 2014
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.
Source:	arXiv, 1410.6358
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