Discovery and characterization of WASP-6b, an inflated sub-Jupiter mass planet transiting a solar-type star

M. Gillon, D.~R. Anderson, A.~H.~M.~J. Triaud, C. Hellier, P.~F.~L. Maxted, D. Pollaco, D. Queloz, B. Smalley, R.~G. West, D.~M. Wilson, S.~J. Bentley, A. Collier Cameron, B. Enoch, L. Hebb, K. Horne, J. Irwin, Y.~C. Joshi, T.~A. Lister, M. Mayor, F. PepeN. Parley, D. Segransan, S. Udry, P.~J. Wheatley

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We report the discovery of WASP-6b, an inflated sub-Jupiter mass planet transiting every 3.3610060$^+ 0.0000022 $$_- 0.0000035 $ days a mildly metal-poor solar-type star of magnitude V = 11.9. A combined analysis of the WASP photometry, high-precision followup transit photometry and radial velocities yield a planetary mass M$_p$ = 0.503$^+0.019$$_-0.038$ M$_J$ and radius R$_p$ = 1.224$^+0.051$$_-0.052$ RJ, resulting in a density $$_p$ = 0.27 plusmn 0.05 $J. The mass and radius for the host star are Mast = 0.88$^+0.05$$_-0.08$ Msun and Rast = 0.870$^+0.025$$_-0.036$ Rsun. The non-zero orbital eccentricity e = 0.054+0.018$_-0.015$ that we measure suggests that the planet underwent a massive tidal heating 1 Gyr ago that could have contributed to its inflated radius. High-precision radial velocities obtained during a transit allow us to measure a sky-projected angle between the stellar spin and orbital axis $ = 11$^+14$$_-18$ deg. In addition to similar published measurements, this result favors a dominant migration mechanism based on tidal interactions with a protoplanetary disk. Based on data collected with the HARPS spectrograph at ESO La Silla Observatory in the programs 082.C-0040(E) and 082.C-0608. The photometric time-series and radial velocities (Tables 4, 5) used in this work are only available in electronic form at the CDS via anonymous ftp to ( or via
Original languageEnglish
Pages (from-to)785-792
Number of pages8
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jul 2009


  • binaries: eclipsing, stars: individual: WASP-6, planetary systems, techniques: photometric, techniques: radial velocities, techniques: spectroscopic


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