WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star

Autoria(s): Faedi, F.; Barros, S. C. C.; Anderson, D. R.; Brown, D. J. A.; Collier Cameron, A.; Pollacco, D.; Boisse, I.; Hébrard, 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.; 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.
Data(s)

01/07/2011
Resumo

We 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 slightly more massive and highly irradiated planets. From our spectral analysis, the metallicity of WASP-39 is measured to be [Fe/H] = -0.12 +/- 0.1 dex, and we find the planet to have an equilibrium temperature of 1116(-32)(+33) K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.
Formato

application/pdf
Identificador

http://pure.qub.ac.uk/portal/en/publications/wasp39b-a-highly-inflated-saturnmass-planet-orbiting-a-late-gtype-star(ba13ab55-4d82-4d28-9c27-ce22333cf6e9).html

http://dx.doi.org/10.1051/0004-6361/201116671

http://pure.qub.ac.uk/ws/files/2529141/WASP_39b_a_highly_inflated_Saturn_mass_planet_orbiting_a_late_G_type_star.pdf
Idioma(s)

eng
Direitos

info:eu-repo/semantics/openAccess
Fonte

Faedi , F , Barros , S C C , Anderson , D R , Brown , D J A , Collier Cameron , A , Pollacco , D , Boisse , I , Hébrard , 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 , 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 2011 , ' WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star ' Astronomy and Astrophysics , vol 531 , A40 , pp. 1-8 . DOI: 10.1051/0004-6361/201116671
Palavras-Chave #/dk/atira/pure/subjectarea/asjc/3100/3103 #Astronomy and Astrophysics #/dk/atira/pure/subjectarea/asjc/1900/1912 #Space and Planetary Science
Tipo

article
Acesso ao item digital