WASP-37b: A 1.8 M-J EXOPLANET TRANSITING A METAL-POOR STAR

E. K. Simpson*, F. Faedi, S. C. C. Barros, D. J. A. Brown, A. Collier Cameron, L. Hebb, D. Pollacco, B. Smalley, I. Todd, O. W. Butters, G. Hebrard, J. McCormac, G. R. M. Miller, A. Santerne, R. A. Street, I. Skillen, A. H. M. J. Triaud, D. R. Anderson, J. Bento, I. BoisseF. Bouchy, B. Enoch, C. A. Haswell, C. Hellier, S. Holmes, K. Horne, F. P. Keenan, T. A. Lister, P. F. L. Maxted, V. Moulds, C. Moutou, A. J. Norton, N. Parley, F. Pepe, D. Queloz, D. Segransan, A. M. S. Smith, H. C. Stempels, S. Udry, C. A. Watson, R. G. West, P. J. Wheatley

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)

Abstract

We report on the discovery of WASP-37b, a transiting hot Jupiter orbiting an m(v) = 12.7 G2-type dwarf, with a period of 3.577469 +/- 0.000011 d, transit epoch T-0 = 2455338.6188 +/- 0.0006 (HJD; dates throughout the paper are given in Coordinated Universal Time (UTC)), and a transit duration 0.1304(-0.0017)(+0.0018) d. The planetary companion has a mass M-p = 1.80 +/- 0.17 M-J and radius R-p = 1.16(-0.06)(+0.07) R-J, yielding a mean density of 1.15(-0.15)(+0.12) rho(J). From a spectral analysis, we find that the host star has M-star = 0.925 +/- 0.120 M-circle dot, R-star = 1.003 +/- 0.053 R-circle dot, T-eff = 5800 +/- 150 K, and [Fe/H] = -0.40 +/- 0.12. WASP-37 is therefore one of the lowest metallicity stars to host a transiting planet.

Original languageEnglish
Article number8
Number of pages7
JournalAstronomical Journal
Volume141
Issue number1
DOIs
Publication statusPublished - Jan 2011

Keywords

  • planetary systems
  • stars: individual (WASP-37, GSC 00326-00658)
  • techniques: photometric
  • techniques: spectroscopic
  • STELLAR ATMOSPHERE MODELS
  • LIMB-DARKENING LAW
  • EXTRASOLAR PLANETS
  • SURFACE GRAVITIES
  • GIANT PLANETS
  • PARENT STARS
  • LOW-DENSITY
  • PARAMETERS
  • SYSTEM
  • METALLICITY

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