WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star
- Moutou, C.
- Norton, A. J.
- Queloz, D.
- Santerne, A.
- Simpson, E. K.
- Skillen, I.
- Smith, A. M. S.
- Udry, S.
- Watson, C. A.
- West, R. G.
- Wheatley, P. J.
- Faedi, F.
- Barros, S. C. C.
- Anderson, D. R.
- Brown, D. J. A.
- Cameron, A. Collier
- Pollacco, D.
- Boisse, I.
- Hebrard, G.
- Lendl, M.
- Lister, T. A.
- Smalley, B.
- Street, R. A.
- Triaud, A. H. M. J.
- Bento, J.
- Bouchy, F.
- Butters, O. W.
- Enoch, B.
- Haswell, C. A.
- Hellier, C.
- Keenan, F. P.
- Miller, G. R. M.
- Moulds, V.
DOIAbstract
International audienceWe present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of 4.055259 +/- 0.000008 d, Transit Epoch T-0 = 2 455 342.9688 +/- 0.0002 (HJD), of duration 0.1168 +/- 0.0008 d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of M-pl = 0.28 +/- 0.03 M-J and a radius of R-pl = 1.27 +/- 0.04 R-J, resulting in a mean density of 0.14 +/- 0.02 rho(J). The stellar parameters are mass M-star = 0.93 +/- 0.03 M-circle dot, radius R-star = 0.895 +/- 0.23 R-circle dot, and age 9(-4)(+3) Gyr. Only WASP-17b and WASP-31b have lower densities than WASP-39b, although they are sligh...
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