Article (Scientific journals)
Thermal emission at 4.5 and 8 micron of WASP-17b, an extremely large planet in a slightly eccentric orbit
Anderson, D. R.; Smith, A. M. S.; Lanotte, Audrey et al.
2011In Monthly Notices of the Royal Astronomical Society, 416 (3), p. 2108-2122
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We report the detection of thermal emission at 4.5 and 8 micron from the planet WASP-17b. We used Spitzer to measure the system brightness at each wavelength during two occultations of the planet by its host star. By combining the resulting light curves with existing transit light curves and radial velocity measurements in a simultaneous analysis, we find the radius of WASP-17b to be 2.0 Rjup, which is 0.2 Rjup larger than any other known planet and 0.7 Rjup larger than predicted by the standard cooling theory of irradiated gas giant planets. We find the retrograde orbit of WASP-17b to be slightly eccentric, with 0.0012 < e < 0.070 (3 sigma). Such a low eccentricity suggests that, under current models, tidal heating alone could not have bloated the planet to its current size, so the radius of WASP-17b is currently unexplained. From the measured planet-star flux-density ratios we infer 4.5 and 8 micron brightness temperatures of 1881 +/- 50 K and 1580 +/- 150 K, respectively, consistent with a low-albedo planet that efficiently redistributes heat from its day side to its night side.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Anderson, D. R.
Smith, A. M. S.
Lanotte, Audrey ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Barman, T. S.
Campo, C. J.
Collier Cameron, A.
Gillon, Michaël  
Harrington, J.
Hellier, C.
Maxted, P. F. L.
Queloz, D.
Triaud, A H M J
Wheatley, P. J.
More authors (3 more) Less
Language :
English
Title :
Thermal emission at 4.5 and 8 micron of WASP-17b, an extremely large planet in a slightly eccentric orbit
Publication date :
28 September 2011
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
416
Issue :
3
Pages :
2108-2122
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 July 2011

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