Volume 562, February 2014
|Number of page(s)||4|
|Published online||05 February 2014|
WASP-103 b: a new planet at the edge of tidal disruption ⋆
1 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, Sart Tilman, 4000 Liège 1, Belgium
2 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
3 SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
4 Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
5 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
6 Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
7 N. Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
8 Department of Physics and Kavli Institute for Astrophysics & Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Received: 8 November 2013
Accepted: 9 January 2014
We report the discovery of WASP-103 b, a new ultra-short-period planet (P = 22.2 h) transiting a 12.1 V-magnitude F8-type main-sequence star (1.22 ± 0.04 M⊙, 1.44-0.03+0.05 R⊙, Teff = 6110 ± 160 K). WASP-103 b is significantly more massive (1.49 ± 0.09 MJup) and larger (1.53-0.07+0.05 RJup) than Jupiter. Its large size and extreme irradiation (~ 9 × 109 erg s-1 cm-2) make it an exquisite target for a thorough atmospheric characterization with existing facilities. Furthermore, its orbital distance is less than 20% larger than its Roche radius, meaning that it might be significantly distorted by tides and might experience mass loss through Roche-lobe overflow. It thus represents a new key object for understanding the last stage of the tidal evolution of hot Jupiters.
Key words: planetary systems / stars: individual: WASP-103 / techniques: photometric / techniques: radial velocities / techniques: spectroscopic
The photometric and radial velocity time-series are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/562/L3
© ESO, 2014
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