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WASP-28b: a hot Jupiter transiting a low-metallicity star

We report the discovery of a transiting exoplanet in a 3.408 day orbit about an early G-type star. The host star has a mass of 1.08 ± 0.04Msun , a radius of 1.05 ± 0.06Rsun, an effective temperature of 6100 ± 150K, and a metallicity [Fe/H] = −0.29 ± 0.10 which is amongst the lowest measured for the host star of a transiting exoplanet. We combine the available spectral and photometric data to measure the planet’s mass of 0.91 ± 0.06MJ and radius of 1.12 ± 0.06RJ . We find the measured radius to be consistent with theoretical evolutionary models of an irradiated planet with a low heavy element content.
Paper Reference: 

Submitted to AJ

Paper Authors: 
R. G. West, D. R. Anderson, D. J. A. Brown, A. Collier Cameron, M. Gillon, C. Hellier, T. A. Lister, P. F. L. Maxted, D. Queloz, B. Enoch, N. Parley, F. Pepe, D. Pollacco, D. Segransan, B. Smalley,A. H. M. J. Triaud, S. Udry