Thumbnail
Access Restriction
Open

Author Machalek, Pavel ♦ McCullough, Peter R. ♦ Burke, Christopher J. ♦ Valenti, Jeff A. ♦ Burrows, Adam ♦ Hora, Joseph L.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-05-16
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics ♦ physics:astro-ph
Abstract We estimate flux ratios of the extrasolar planet XO-1b to its host star XO-1 at 3.6, 4.5, 5.8 and 8.0 microns with the IRAC on the Spitzer Space Telescope to be 0.00086 +/- 0.00007, 0.00122 +/- 0.00009, 0.00261 +/- 0.00031 and 0.00210 +/- 0.00029, respectively. The fluxes are inconsistent with a canonical cloudless model for the thermal emission from a planet and suggest an atmosphere with a thermal inversion layer and a possible stratospheric absorber. A newly emerging correlation between the presence of a thermal inversion layer in the planetary atmosphere and stellar insolation of the planet (Burrows et al. 2007b) is refined. The sub-stellar point flux from the parent star at XO-1b of ~ 0.49 x 10^9 erg cm^-2 s^-1 sets a new lower limit for the occurrence of a thermal inversion in a planetary atmosphere.
Description Comment: 7 pages, 4 figures, 2 tables, accepted for publication to ApJ
Reference: 2008ApJ...684.1427M
Educational Use Research
Learning Resource Type Article
Page Count 7


Open content in new tab

   Open content in new tab