Thermal Emission Of Exoplanet XO-1b - IOPscience

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The following article is Free articleThermal Emission of Exoplanet XO-1b

Pavel Machalek, Peter R. McCullough, Christopher J. Burke, Jeff A. Valenti, Adam Burrows, and Joseph L. Hora

© 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A. The Astrophysical Journal, Volume 684, Number 2Citation Pavel Machalek et al 2008 ApJ 684 1427DOI 10.1086/590140

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Pavel Machalek

AFFILIATIONS

Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Peter R. McCullough

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Christopher J. Burke

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Jeff A. Valenti

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Adam Burrows

AFFILIATIONS

Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544

Joseph L. Hora

AFFILIATIONS

Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-65, Cambridge, MA 02138

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Open scienceAuthors

Pavel Machalek

AFFILIATIONS

Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Peter R. McCullough

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Christopher J. Burke

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Jeff A. Valenti

AFFILIATIONS

Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

Adam Burrows

AFFILIATIONS

Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544

Joseph L. Hora

AFFILIATIONS

Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-65, Cambridge, MA 02138

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Dates

1. Received 2008 March 21
2. Accepted 2008 May 15

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0004-637X/684/2/1427

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 μm with 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, as by Burrows and colleagues, is refined. The substellar point flux from the parent star at XO-1b of ~0.49 × 109 erg cm−2 s−1 sets a new lower limit for the occurrence of a thermal inversion in a planetary atmosphere.

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Show referencesPlease wait… references are loading.Back to top10.1086/590140