The first planet detected in the WTS: an inflated hot Jupiter in a 3.35 d orbit around a late F star

Cappetta, M.; Saglia, R. P.; Birkby, J. L.; Koppenhoefer, J.; Pinfield, D. J.; Hodgkin, S. T.; Cruz, P.; Kovács, G.; Sipőcz, B.; Barrado, D; Nefs, B; Pavlenko, Y. V.; Fossati, L.; del Burgo, C.; Martin, E. L.; Snellen, I.; Barnes, J.; Bayo, A.; Campbell, D. A.; Catalan, S.; Galvez-Ortiz, M. C.; Goulding, N.; Haswell, C.; Ivanyuk, O.; Jones, H. R.; Kuznetsov, M.; Lodieu, N.; Marocco, F.; Mislis, D.; Murgas, F.; Napiwotzki, R.; Palle, E.; Pollacco, D.; Sarro Baro, L.; Solano, E.; Steele, P.; Stoev, H.; Tata, R. and Zendejas, J. (2012). The first planet detected in the WTS: an inflated hot Jupiter in a 3.35 d orbit around a late F star. Monthly Notices of the Royal Astronomical Society, 427(3) pp. 1877–1890.

DOI: https://doi.org/10.1111/j.1365-2966.2012.21937.x

URL: http://mnras.oxfordjournals.org/content/427/3/1877

Abstract

We report the discovery of WTS-1b, the first extrasolar planet found by the WFCAM Transit Survey, which began observations at the 3.8-m United Kingdom Infrared Telescope (UKIRT) in 2007 August. Light curves comprising almost 1200 epochs with a photometric precision of better than 1 per cent to J ˜ 16 were constructed for ˜60 000 stars and searched for periodic transit signals. For one of the most promising transiting candidates, high-resolution spectra taken at the Hobby-Eberly Telescope (HET) allowed us to estimate the spectroscopic parameters of the host star, a late-F main-sequence dwarf (V = 16.13) with possibly slightly subsolar metallicity, and to measure its radial velocity variations. The combined analysis of the light curves and spectroscopic data resulted in an orbital period of the substellar companion of 3.35 d, a planetary mass of 4.01 ± 0.35 M_J and a planetary radius of 1.49_-0.18^+0.16 R_J. WTS-1b has one of the largest radius anomalies among the known hot Jupiters in the mass range 3-5 M_J. The high irradiation from the host star ranks the planet in the pM class.

Viewing alternatives

Metrics

Item Actions

Export

You can export this page using these formats Digital Object Identifier - DOI