Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532702m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #327.02; Bulletin of the American Astronomical Society, Vol. 42, p.424
Other
Scientific paper
This thesis aims to detect thermal radiation from 3 unique Hot-Jupiters, discovered by the XO team, using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope in order to obtain broadband spectra in the infrared to constrain the upper atmospheric temperature structure of Hot-Jupiters.The infrared spectral energy distributions of 3 Hot-Jupiters XO-1b, XO-2b and XO-3b have revealed a presence of a thermally inverted stratosphere in all 3 of them. Since the 3 XO Hot-Jupiters occupy a wide range of substellar point fluxes (Fp 0.49 - 4.2 109 erg cm^-2 s-1 ) it allows us to set a threshold bolometric substellar point flux on the planetabove which the intense optical/UV light from the star drives a thermal inversion - a hot stratosphere.
We suggest that other factors can determine the presence of hot stratospheres in Hot-Jupiters: the substellar point UV flux would be a more appropriate measure of planetary insolation than bolometric flux as upper atmospheric absorbers (TiO, VO and sulfur compounds H2 and HS) absorb in the optical/UV spectrum and dynamic effects in the atmosphere like equatorial jets and shocks as suggested by 3D global circulation models can induce stratospheres without extra upper atmospheric absorbers.
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