The 0.5M(J) transiting exoplanet WASP-13b

I. Skillen, D. Pollacco, E. Cameron, L. Hebb, E. Simpson, F. Bouchy, D. J. Christian, N. P. Gibson, G. Hebrard, Y. C. Joshi, B. Loeillet, B. Smalley, H.C. Stempels, R. Street, S. Udry, R. G. West, D. R. Anderson, S. C. C. Barros, B. Enoch, C.A. HaswellC. Hellier, K. Horne, J. Irwin, F. P. Keenan, T. A. Lister, P. Maxted, M. Mayor, C. Moutou, A. J. Norton, N. Parley, D. Queloz, R. Ryans, I. Todd, P. J. Wheatley, D. M. Wilson

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We report the discovery of WASP-13b, a low-mass M-p = 0.46(-0.05)(+0.06) M-J transiting exoplanet with an orbital period of 4.35298 +/- 0.00004 days. The transit has a depth of 9 mmag, and although our follow-up photometry does not allow us to constrain the impact parameter well (0 <b <0.46), with radius in the range R-p similar to 1.06-1.21 R-J the location of WASP-13b in the mass-radius plane is nevertheless consistent with H/He-dominated, irradiated, low core mass and core-free theoretical models. The G1V host star is similar to the Sun in mass (M-* = 1.03(-0.09)(+0.11) M-circle dot) and metallicity ([M/H] = 0.0 +/- 0.2), but is possibly older (8.5(-4.9)(+5.5) Gyr).
Original languageEnglish
Pages (from-to)391-394
Number of pages4
JournalAstronomy and Astrophysics
Publication statusPublished - Jul 2009

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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