WASP-40b: Independent Discovery of the 0.6 MJup Transiting Exoplanet HAT-P-27b

D. R. Anderson, S. C. C. Barros, I. Boisse, F. Bouchy, A. Collier Cameron, F. Faedi, G. HĂ©brard, C. Hellier, M. Lendl, C. Moutou, D. Pollacco, A. Santerne, B. Smalley, A. M. S. Smith, I. Todd, A. H. M. J. Triaud, R. G. West, P. J. Wheatley, J. Bento, B. Enoch, M. Gillon, P. F. L. Maxted, J. McCormac, D. Queloz, E. Simpson, I. Skillen

Abstract
From WASP photometry and SOPHIE radial velocities we report the discovery of WASP-40b (HAT-P-27b), a 0.6 MJup planet that transits its 12th magnitude host star every 3.04 days. The host star is of late G-type or early K-type and likely has a metallicity greater than solar ([Fe/H] = 0.14 &plusmin; 0.11). The planet's mass and radius are typical of the known hot Jupiters, thus adding another system to the apparent pileup of transiting planets with periods near 3-4 days. Our parameters match those of the recent HATnet announcement of the same planet, thus giving confidence in the techniques used. We report a possible indication of stellar activity in the host star.

Publications of the Astronomical Society of the Pacific
Volume 123, Page 555
May 2011

DOI: 10.1086/660135
ADS Bibliographic code: 2011PASP..123..555A