WASP-37b: a 1.8 MJ 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. Hébrard, 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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We report on the discovery of WASP-37b, a transiting hot Jupiter orbiting an mv = 12.7 G2-type dwarf, with a period of 3.577469 ± 0.000011 d, transit epoch T0 = 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 Mp = 1.80 ± 0.17 MJ and radius R p = 1.16-0.06 +0.07 RJ, yielding a mean density of 1.15-0.15 +0.12 ρJ. From a spectral analysis, we find that the host star has M* = 0.925 ± 0.120M⊙, R* = 1.003 ± 0.053 R⊙, Teff = 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
Pages (from-to)1-7
Number of pages7
JournalAstronomical Journal
Issue number1
Publication statusPublished - Jan 2011
Externally publishedYes


  • Planetary systems
  • Stars: individual (WASP-37, GSC 00326-00658)
  • Techniques: photometric
  • Techniques: spectroscopic


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