EPJ Web of Conferences 47, 01003 (2013)
https://doi.org/10.1051/epjconf/20134701003

WTS1 b: The first planet detected in the WFCAM Transit Survey

An inflated hot-Jupiter in a 3.35 day orbit around a late F-star^*

¹ Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany
² Universitatssternwarte Scheinerstrasse 1, 81679 Munchen, Germany
³ Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
⁴ Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK
⁵ Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
⁶ Departamento de Astrofísica, Centro de Astrobiología (CSIC/INTA), PO Box 78, 28691 Villanueva de la Canada, Spain

^a e-mail: cappetta@mpe.mpg.de

Abstract

We report the discovery of WTS1 b, the first extrasolar planet found by the WFCAM Transit Survey. 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), and to measure its radial velocity variations. The combined analysis of the light curves and spectroscopic data resulted in an orbital period of the companion of 3.35 days, a planetary mass of 4.01 ± 0.35 M_J, and a planetary radius of 1.49 ^+0.16_-0.18 R_J. WTS1 b has one of the largest radius anomalies among the known hot Jupiters in the mass range 3–5 M_J.