Published in

EDP Sciences, Astronomy & Astrophysics, (531), p. A40, 2011

DOI: 10.1051/0004-6361/201116671

Links

Tools

Export citation

Search in Google Scholar

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

Journal article published in 2011 by F. Faedi, Scc C. C. Barros ORCID, Dr R. Anderson, Dja J. A. Brown, A. Collier Cameron, Don Pollacco, I. Boisse, G. Hébrard, G. Hebrard, M. Lendl, Ta A. Lister, B. Smalley, Ra A. Street, Ahmj H. M. J. Triaud, Joao Paulo da Silva Bento and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Red circle
Preprint: archiving forbidden
Green circle
Postprint: archiving allowed
Upload
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

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.