Volume 526, February 2011
|Number of page(s)||5|
|Section||Planets and planetary systems|
|Published online||11 January 2011|
WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system⋆
Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
2 SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
3 Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
4 Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
5 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C, Liège 1, Belgium
6 Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Santa Barbara, CA 93117, USA
7 Astrophysics Research Centre, School of Mathematics & Physics, Queen’s University, University Road, Belfast, BT7 1NN, UK
8 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Received: 25 October 2010
Accepted: 9 December 2010
We report the discovery of WASP-34b, a sub-Jupiter-mass exoplanet transiting its 10.4-magnitude solar-type host star (1SWASP J110135.89-235138.4; TYC 6636-540-1) every 4.3177 days in a slightly eccentric orbit (e = 0.038 ± 0.012). We find a planetary mass of 0.59 ± 0.01 MJup and radius of RJup. There is a linear trend in the radial velocities of 55 ± 4 m s-1 y-1 indicating the presence of a long-period third body in the system with a mass ≳0.45 MJup at a distance of ≳1.2 AU from the host star. This third-body is either a low-mass star, a white dwarf, or another planet. The transit depth ((RP/R∗)2 = 0.0126) and high impact parameter (b = 0.90) suggest that this could be the first known transiting exoplanet expected to undergo grazing transits, but with a confidence of only ~80%.
Key words: planets and satellites: general / stars: individual: WASP-34 / techniques: photometric / techniques: spectroscopic / techniques: radial velocities
Radial velocity and photometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/526/A130
© ESO, 2011
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