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

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Faedi, F., Barros, S. C. C., Anderson, D. R., Brown, D. J. A., Collier Cameron, A., Pollacco, Don, Boisse, I., Hebrard, G., Lendl, M., Lister, T. A. et al.

. (2011) WASP-39b : a highly inflated Saturn-mass planet orbiting a late G-type star. Astronomy & Astrophysics, Vol.531 . A40. ISSN 0004-6361

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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 > Physics
Library of Congress Subject Headings (LCSH):	Planets
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	E D P Sciences
ISSN:	0004-6361
Date:	July 2011
Volume:	Vol.531
Page Range:	A40
Identification Number:	10.1051/0004-6361/201116671
Status:	Peer Reviewed
Publication Status:	Published
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) (FP7/2007-2013)
Grant number:	RG226604 (FP7)
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URI:	http://wrap.warwick.ac.uk/id/eprint/38506