ORBi: Anderson D. R. - Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star

Reference : Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orb...


	Document type :	E-prints/Working papers : Already available on another site
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/107263

Title :	Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star
Language :	English
Author, co-author :	Anderson, D. R. [> > > >]
	Smith, A. M. S. [> > > >]
	Madhusudhan, N. [> > > >]
	Wheatley, P. J. [> > > >]
	Collier Cameron, A. [> > > >]
	Hellier, C. [> > > >]
	Campo, C. [> > > >]
	Gillon, Michaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
	Harrington, J. [> > > >]
	Maxted, P. F. L. [> > > >]
	Pollacco, D. [> > > >]
	Queloz, D. [> > > >]
	Smalley, B. [> > > >]
	Triaud, A H M J [> > > >]
	West, R. G. [> > > >]
Publication date :	1-Dec-2011
Keywords :	[en] Astrophysics - Earth and Planetary Astrophysics
Abstract :	[en] We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 micron. We used the InfraRed Array Camera on the Spitzer Space Telescope to observe two occultations of WASP-19b by its host star. We combine our new detections with previous measurements of WASP-19b's emission at 1.6 and 2.09 micron to construct a spectral energy distribution of the planet's dayside atmosphere. By comparing this with model-atmosphere spectra, we find that the dayside atmosphere of WASP-19b lacks a strong temperature inversion. As WASP-19 is an active star (log RHK = -4.50 +/- 0.03), this finding supports the hypothesis of Knutson, Howard & Isaacson (2010) that inversions are suppressed in hot Jupiters orbiting active stars. The available data are unable to differentiate between a carbon-rich and an oxygen-rich atmosphere.
Permalink :	http://hdl.handle.net/2268/107263
Other URL :	http://adsabs.harvard.edu/abs/2011arXiv1112.5145A
Commentary :	Submitted to MNRAS. 11 pages, 5 figures, 3 tables. arXiv admin note: substantial text overlap with arXiv:1101.5620
source URL :	http://adsabs.harvard.edu/abs/2011arXiv1112.5145A

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