WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system

Smalley, B.; R. Anderson, D.; Collier Cameron, A.; Hellier, C.; Lendl, M.; F. L. Maxted, P.; Queloz, D.; H. M. J. Triaud, A.; G. West, R.; J. Bentley, S.; Enoch, B.; Gillon, M.; A. Lister, T.; Pepe, F.; Pollacco, D.; Segransan, D.; M. S. Smith, A.; Southworth, J.; Udry, S.; J. Wheatley, P.; L. Wood, P.; Bento, J.

doi:10.1051/0004-6361/201015992

WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system

Smalley, B.; R. Anderson, D.; Collier Cameron, A.; Hellier, C.; Lendl, M.; F. L. Maxted, P.; Queloz, D.; H. M. J. Triaud, A.; G. West, R.; J. Bentley, S.; Enoch, B.; Gillon, M.; A. Lister, T.; Pepe, F.; Pollacco, D.; Segransan, D.; M. S. Smith, A.; Southworth, J.; Udry, S.; J. Wheatley, P.; L. Wood, P.; Bento, J.

Authors

Barry Smalley b.smalley@keele.ac.uk

D. R. Anderson

A. Collier Cameron

Coel Hellier c.hellier@keele.ac.uk

M. Lendl

Pierre Maxted p.maxted@keele.ac.uk

D. Queloz

A. H. M. J. Triaud

R. G. West

S. J. Bentley

B. Enoch

M. Gillon

T. A. Lister

F. Pepe

D. Pollacco

D. Segransan

A. M. S. Smith

Dr John Taylor j.k.taylor@keele.ac.uk

S. Udry

P. J. Wheatley

P. L. Wood

J. Bento

Abstract

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 M_Jup and radius of 1.22 ^{+0.11}_{-0.08} R_Jup. There is a linear trend in the radial velocities of 55+/-4 m/s/y indicating the presence of a long-period third body in the system with a mass > 0.45 M_Jup at a distance of >1.2 AU from the host star. This third-body is either a low-mass star, white dwarf, or another planet. The transit depth ((R_P/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%.

Citation

Smalley, B., R. Anderson, D., Collier Cameron, A., Hellier, C., Lendl, M., F. L. Maxted, P., …Bento, J. (2011). WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201015992

Journal Article Type	Article
Acceptance Date	Dec 9, 2010
Online Publication Date	Jan 11, 2011
Publication Date	2011-02
Deposit Date	Jul 6, 2023
Publicly Available Date	Jul 6, 2023
Journal	Astronomy & Astropysics
Print ISSN	0004-6361
Electronic ISSN	1432-0746
Publisher	EDP Sciences
Peer Reviewed	Peer Reviewed
DOI	https://doi.org/10.1051/0004-6361/201015992
Keywords	Earth and Planetary Astrophysics; planets and satellites: general / stars: individual: WASP-34 / techniques: photometric / techniques: spectroscopic / techniques: radial velocities