WASP-80b: a gas giant transiting a cool dwarf

A.H.M.J. Triaud, D.R. Anderson, A. Collier Cameron, A.P. Doyle, A. Fumel, M. Gillon, C. Hellier, E. Jehin, M. Lendl, C. Lovis, P.F.L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, A.M.S. Smith, S. Udry, R.G. West, P.J. Wheatley

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Abstract

We report the discovery of a planet transiting the star WASP-80 (1SWASP J201240.26-020838.2; 2MASS J20124017-0208391; TYC 5165-481-1; BPM 80815; V = 11.9, K = 8.4). Our analysis shows this is a 0.55 ± 0.04 Mjup, 0.95 ± 0.03 Rjup gas giant on a circular 3.07 day orbit around a star with a spectral type between K7V and M0V. This system produces one of the largest transit depths so far reported, making it a worthwhile target for transmission spectroscopy. We find a large discrepancy between the vsini inferred from stellar line broadening and the observed amplitude of the Rossiter-McLaughlin effect. This can be understood either by an orbital plane nearly perpendicular to the stellar spin or by an additional, unaccounted for source of broadening.

Original languageEnglish
Article numberA80
Number of pages5
JournalAstronomy & Astrophysics
Volume551
Early online date26 Feb 2013
DOIs
Publication statusPublished - Mar 2013

Keywords

  • Planetary systems
  • Binaries: eclipsing
  • Stars: individual: WASP-80
  • Techniques: radial velocities
  • Techniques: photometric
  • Techniques: spectroscopic

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