(2011) WASP-23b : a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect. Astronomy & Astrophysics, Volume 531 . Article number A24. doi:10.1051/0004-6361/201016367

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Abstract

We report the discovery of a new transiting planet in the southern hemisphere. It was found by the WASP-south transit survey and confirmed photometrically and spectroscopically by the 1.2 m Swiss Euler telescope, LCOGT 2m Faulkes South Telescope, the 60 cm TRAPPIST telescope, and the ESO 3.6 m telescope. The orbital period of the planet is 2.94 days. We find that it is a gas giant with a mass of 0.88 ± 0.10   MJ and an estimated radius of 0.96 ± 0.05   RJ. We obtained spectra during transit with the HARPS spectrograph and detect the Rossiter-McLaughlin effect despite its small amplitude. Because of the low signal-to-noise ratio of the effect and a small impact parameter, we cannot place a strong constraint on the projected spin-orbit angle. We find two conflicting values for the stellar rotation. We find, via spectral line broadening, that v   sin   I = 2.2 ± 0.3 km s-1, while applying another method, based on the activity level using the index , gives an equatorial rotation velocity of only v = 1.35 ± 0.20 km s-1. Using these as priors in our analysis, the planet might be either misaligned or aligned. This result raises doubts about the use of such priors. There is evidence of neither eccentricity nor any radial velocity drift with time.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	July 2011
Dates:	Date Event July 2011 Published
Volume:	Volume 531
Article Number:	Article number A24
DOI:	10.1051/0004-6361/201016367
Status:	Peer Reviewed
Publication Status:	Published

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