Reference : Thermal emission at 4.5 and 8 micron of WASP-17b, an extremely large planet in a slightl...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/95426
Thermal emission at 4.5 and 8 micron of WASP-17b, an extremely large planet in a slightly eccentric orbit
English
Anderson, D. R. [> > > >]
Smith, A. M. S. [> > > >]
Lanotte, Audrey [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
Barman, T. S. [> > > >]
Campo, C. J. [> > > >]
Collier Cameron, A. [> > > >]
Gillon, Michaël mailto [> > > >]
Harrington, J. [> > > >]
Hellier, C. [> > > >]
Maxted, P. F. L. [> > > >]
Queloz, D. [> > > >]
Triaud, A H M J [> > > >]
Wheatley, P. J. [ > > ]
28-Sep-2011
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
416
3
2108-2122
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] Astrophysics - Earth and Planetary Astrophysics
[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.
http://hdl.handle.net/2268/95426
http://adsabs.harvard.edu/abs/2011arXiv1101.5620A

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