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

B. Smalley, D.~R. Anderson, A. Collier Cameron, C. Hellier, M. Lendl, P.~F.~L. Maxted, 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, J. Southworth, S. Udry, P.~J. WheatleyP.~L. Wood, J. Bento

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33 Citations (Scopus)


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 = 0.038plusmn0.012). We find a planetary mass of 0.59plusmn0.01 M$_Jup$ and radius of 1.22$_-0.08$$^+0.11$ R$_Jup$. There is a linear trend in the radial velocities of 55plusmn4 m s$^-1$ y$^-1$ indicating the presence of a long-period third body in the system with a mass gap0.45 M$_Jup$ at a distance of gap1.2 AU from the host star. This third-body is either a low-mass star, a white dwarf, or another planet. The transit depth ((R$_P$/R$_star$)$^2$ = 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 Radial velocity and photometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/526/A130
Original languageEnglish
Pages (from-to)A130
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Feb 2011


  • planets and satellites: general, stars: individual: WASP-34, techniques: photometric, techniques: spectroscopic, techniques: radial velocities


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