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 (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/526/A130
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.