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. 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

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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 plusmn 0.000011 d, transit epoch T $_0$ = 2455338.6188 plusmn 0.0006 (HJD; dates throughout the paper are given in Coordinated Universal Time (UTC)), and a transit duration 0.1304$^+0.0018$ $_-0.0017$ d. The planetary companion has a mass M $_p$ = 1.80 plusmn 0.17 M $_J$ and radius R $_p$ = 1.16$^+0.07$ $_-0.06$ R $_J$, yielding a mean density of 1.15$^+0.12$ $_-0.15$ $$_J$. From a spectral analysis, we find that the host star has M $_sstarf$ = 0.925 plusmn 0.120 M $_sun$, R $_sstarf$ = 1.003 plusmn 0.053 R $_sun$, T $_eff$ = 5800 plusmn 150 K, and [Fe/H] = -0.40 plusmn 0.12. WASP-37 is therefore one of the lowest metallicity stars to host a transiting planet.
Original languageEnglish
Pages (from-to)8
Number of pages1
JournalThe Astronomical Journal
Volume141
DOIs
Publication statusPublished - 1 Jan 2011

Keywords

  • planetary systems, stars: individual: WASP-37 GSC 00326-00658, techniques: photometric, techniques: spectroscopic

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