WASP-25b: a 0.6 MJ planet in the Southern hemisphere.

Authors :: Enoch, B.
Cameron, A. Collier
Anderson, D. R.
Lister, T. A.
Hellier, C.
Maxted, P. F. L.
Queloz, D.
Smalley, B.
Triaud, A. H. M. J.
West, R. G.
Brown, D. J. A.
Gillon, M.
Hebb, L.
Lendl, M.
Parley, N.
Pepe, F.
Pollacco, D.
Segransan, D.
Simpson, E.
Street, R. A.
Source :: Monthly Notices of the Royal Astronomical Society; Jan2011, Vol. 410 Issue 3, p1631-1636, 6p, 4 Charts, 9 Graphs
Publication Year :: 2011
Abstract: ABSTRACT We report the detection of a 0.6 M<subscript>J</subscript> 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 R<subscript>p</subscript>= 1.22 R<subscript>J</subscript> and M<subscript>p</subscript>= 0.58 M<subscript>J</subscript> around a slightly metal-poor solar-type host star, [Fe/H]=− 0.05 ± 0.10, of R<subscript>*</subscript>= 0.92 R<subscript>⊙</subscript> and M<subscript>*</subscript>= 1.00 M<subscript>⊙</subscript>. WASP-25b is found to have a density of ρ<subscript>p</subscript>= 0.32 ρ<subscript>J</subscript>, 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. [ABSTRACT FROM AUTHOR]