Journal Article

WASP-25b: a 0.6 <i>M</i><sub>J</sub> planet in the Southern hemisphere

B. Enoch, A. Collier Cameron, D. R. Anderson, T. A. Lister, C. Hellier, P. F. L. Maxted, D. Queloz, B. Smalley, A. H. M. J. Triaud, R. G. West, D. J. A. Brown, M. Gillon, L. Hebb, M. Lendl, N. Parley, F. Pepe, D. Pollacco, D. Segransan, E. Simpson, R. A. Street and S. Udry

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 3, pages 1631-1636
Published in print January 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI:
WASP-25b: a 0.6 MJ planet in the Southern hemisphere

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We report the detection of a 0.6 MJ extrasolar planet by WASP-South, WASP-25b, transiting its solar-type host star every 3.76 d. A simultaneous analysis of the WASP, FTS and Euler photometry and CORALIE spectroscopy yields a planet of Rp= 1.22 RJ and Mp= 0.58 MJ around a slightly metal-poor solar-type host star, [Fe/H]=− 0.05 ± 0.10, of R*= 0.92 R and M*= 1.00 M. WASP-25b is found to have a density of ρp= 0.32 ρJ, a low value for a sub-Jupiter mass planet. We investigate the relationship of planetary radius to planetary equilibrium temperature and host star metallicity for transiting exoplanets with a similar mass to WASP-25b, finding that these two parameters explain the radii of most low-mass planets well.

Keywords: planetary systems

Journal Article.  2950 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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