Issue |
A&A
Volume 526, February 2011
|
|
---|---|---|
Article Number | A130 | |
Number of page(s) | 5 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201015992 | |
Published online | 11 January 2011 |
WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system⋆
1
Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
e-mail: bs@astro.keele.ac.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 (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/526/A130
© ESO, 2011
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