WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system
- Smalley, B.
- Anderson, D. R.
- Collier Cameron, A.
- Hellier, C.
- Lendl, M.
- Maxted, P. F. L.
- Queloz, D.
- Triaud, A H M J
- West, R. G.
- Bentley, S. J.
- Enoch, B.
- Gillon, Michaël
- Lister, T. A.
- Pepe, F.
- Pollacco, D.
- Segransan, D.
- Smith, A. M. S.
- Southworth, J.
- Udry, S.
- Wheatley, P. J.
- Wood, P. L.
- Bento, J.
DOIAbstract
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...
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