SpaceRef

SpaceRef


On the Dayside Thermal Emission of Hot Jupiters

Status Report From: arXiv.org e-Print archive
Posted: Saturday, April 23, 2005

image Astrophysics, abstract
astro-ph/0504212

From: Sara Seager [view email]
Date: Fri, 8 Apr 2005 17:03:19 GMT   (112kb)
On the Dayside Thermal Emission of Hot Jupiters
Authors: S. Seager (Carnegie/DTM), L. J. Richardson (NASA GSFC), B. M. S. Hansen (UCLA), K. Menou (Columbia U.), J. Y-K. Cho (Carnegie/DTM), D. Deming (NASA GSFC)
Comments: 12 pages, 4 figures, submitted to ApJ
We discuss atmosphere models of HD209458b in light of the recent day-side flux measurement of HD209458b's secondary eclipse by Spitzer-MIPS at 24 microns. In addition, we present a revised secondary eclipse IRTF upper limit at 2.2 microns which places a stringent constraint on the adjacent H2O absorption band depths. These two measurements are complementary because they are both shaped by H2O absorption and because the former is on the Wien tail of the planet's thermal emission spectrum and the latter is near the thermal emission peak. A wide range of models fit the observational data, confirming our basic understanding of hot Jupiter atmospheric physics. Although a range of models are viable, some models at the hot and cold end of the plausible temperature range can be ruled out. One class of previously unconsidered hot Jupiter atmospheric models that fit the data are those with C/O >~ 1 (as Jupiter may have), which have a significant paucity of H2O compared to solar abundance models with C/O = 0.5. The models indicate that HD209458b is in a situation intermediate between pure in situ reradiation and very efficient redistribution of heat; one which will require a careful treatment of atmospheric circulation. We discuss how future wavelength-dependent and phase-dependent observations will further constrain the atmospheric circulation regime. In the shorter term, additional planned measurements for HD209458b, especially Spitzer IRAC photometry, should lift many of the model degeneracies. Multiwavelength IR observations constrain the atmospheric structure and circulation properties of hot Jupiters and thus open a new chapter in quantitative extrasolar planetology.
Full-text: PostScript, PDF, or Other formats

References and citations for this submission:
SLAC-SPIRES HEP (refers to , cited by, arXiv reformatted);
CiteBase (autonomous citation navigation and analysis)

Which authors of this paper are endorsers?


Links to: arXiv, astro-ph, /find, /abs (-/+), /0504, ?

// end //

More status reports and news releases or top stories.

Please follow SpaceRef on Twitter and Like us on Facebook.