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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.

Authors

D.R. Anderson

A. Collier Cameron

L. Delrez

M. Gillon

E. Jehin

M. Lendl

F. Pepe

D. Pollacco

D. Queloz

D. Ségransan

A.M.S. Smith

A.H.M.J. Triaud

O.D. Turner

S. Udry

R.G. West



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.

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

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