
The Library
WASP-39b : a highly inflated Saturn-mass planet orbiting a late G-type star
Tools
(2011) WASP-39b : a highly inflated Saturn-mass planet orbiting a late G-type star. Astronomy & Astrophysics, Vol.531 . A40. doi:10.1051/0004-6361/201116671 ISSN 0004-6361.
![]()
|
PDF
WRAP_Wheatley_aa16671-11.pdf - Published Version - Requires a PDF viewer. Download (688Kb) |
Official URL: http://dx.doi.org/10.1051/0004-6361/201116671
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.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Planets | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | E D P Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | July 2011 | ||||
Dates: |
|
||||
Volume: | Vol.531 | ||||
Page Range: | A40 | ||||
DOI: | 10.1051/0004-6361/201116671 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Date of first compliant deposit: | 18 December 2015 | ||||
Date of first compliant Open Access: | 18 December 2015 | ||||
Funder: | Queen's University of Belfast, University of St. Andrews, University of Keele, University of Leicester, Open University, Royal Greenwich Observatory. Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands), Instituto de Astrofísica de Canarias, Science and Technology Facilities Council (Great Britain) (STFC), AWE Aldermarston, Seventh Framework Programme (European Commission) (FP7) | ||||
Grant number: | RG226604 (FP7) |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
![]() |
View Item |
Downloads
Downloads per month over past year