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, [No Value] Quelo, Don Pollacco, D. Segransan, A.M.S. Smith, J. Southworth, S. Udry, P.J. Wheatley, P.L. Wood, J. Bento

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32 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 = 0.038±0.012). We find a planetary mass of 0.59±0.01 MJup and radius of 1.22-0.08+0.11 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/Rstar)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
Article numberA130
JournalAstronomy and Astrophysics
Issue number16
Publication statusPublished - Feb 2011

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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