Hellier, C and Anderson, DR and Cameron, AC and Delrez, L and Gillon, M and Jehin, E and Lendl, M and Maxted, PFL and Pepe, F and Pollacco, D and Queloz, D and Segransan, D and Smalley, B and Smith, AMS and Southworth, J and Triaud, AHMJ and Turner, OD and Udry, S and West, RG (2014) Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b. arXiv.org, 150 (1). ISSN 0004-6256

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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.

Item Type: Article
Uncontrolled Keywords: astrophysics; planetary systems; stars; WASP74; WASP83; WASP89
Subjects: Q Science > QB Astronomy
Related URLs:
Depositing User: Symplectic
Date Deposited: 11 Mar 2015 14:19
Last Modified: 23 May 2016 14:18
URI: http://eprints.keele.ac.uk/id/eprint/324

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