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Title:
The Mid-infrared Spectrum of HD 209458b
Authors:
Swain, Mark R.; Bouwman, J.; Akeson, R.; Lawler, S.; Beichman, C.
Affiliation:
AA(JPL), AB(Max Planck Institute for Astronomy, Germany), AC(Michelson Science Center/Caltech), AD(Michelson Science Center/Caltech), AE(Michelson Science Center/Caltech)
Publication:
American Astronomical Society Meeting 210, #102.03; Bulletin of the American Astronomical Society, Vol. 38, p.229
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...21010203S

Abstract

Using archive data taken with the Spitzer/IRS instrument, we have determined the spectrum of HD 209458b between 8.25 and 13.5 microns with an average SNR of 4 in each 0.25 micron spectral channel. We have used two independent methods, one differential and one absolute, to determine the planet spectrum and find the results are in good agreement. In the mid-infrared, the planet emission is consistent with a featureless spectrum. The absence of strong spectral features is significant in part because the expected water vapor absorption feature is not detected. This work required development of improved methods for Spitzer/IRS data calibration that increase the achievable dynamic range for observations of bright point sources.
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