WASP-25b: a 0.6 Mⱼ planet in the Southern hemisphere
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. · Udry, S.
الأصل · EN
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 days. 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.
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