Three WASP-south transiting exoplanets : WASP-74b, WASP-83b, and WASP-89b
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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 0.95MJup planet with a moderately bloated radius of 1.5 RJup in a 2 day orbit around a slightly evolved F9 star. WASP-83b is a Saturn-mass planet at 0.3 with a radius of 1.0 RJup. It is in a 5 day orbit around a fainter (V = 12.9) G8 star. WASP-89b is a 6 MJup 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.
Hellier , C , Anderson , D R , Collier Cameron , A , Delrez , L , Gillon , M , Jehin , E , Lendl , M , Maxted , P F L , Pepe , F , Pollacco , D , Queloz , D , Ségransan , D , Smalley , B , Smith , A M S , Southworth , J , Triaud , A H M J , Turner , O D , Udry , S & West , R G 2015 , ' Three WASP-south transiting exoplanets : WASP-74b, WASP-83b, and WASP-89b ' Astronomical Journal , vol 150 , no. 1 , 18 . DOI: 10.1088/0004-6256/150/1/18
© 2015. The American Astronomical Society. All rights reserved. Originally published by The Astronomical Journal, http://dx.doi.org/10.1088/0004-6256/150/1/18
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