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Title:
Molecular Signatures in the Near-Infrared Dayside Spectrum of HD 189733b
Authors:
Swain, M. R.; Vasisht, G.; Tinetti, G.; Bouwman, J.; Chen, Pin; Yung, Y.; Deming, D.; Deroo, P.
Affiliation:
AA(Jet Propulsion Laboratory California, Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA), AB(Jet Propulsion Laboratory California, Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA), AC(University College London, Gower Street, London WC1E 6BT, UK), AD(Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany), AE(Jet Propulsion Laboratory California, Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA), AF(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA), AG(Goddard Space Flight Center, Planetary Systems Branch, Code 693, Greenbelt, MD, USA), AH(Jet Propulsion Laboratory California, Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA)
Publication:
The Astrophysical Journal Letters, Volume 690, Issue 2, pp. L114-L117 (2009). (ApJL Homepage)
Publication Date:
01/2009
Origin:
IOP
Astronomy Keywords:
planetary systems, techniques: spectroscopic
DOI:
10.1088/0004-637X/690/2/L114
Bibliographic Code:
2009ApJ...690L.114S

Abstract

We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 μm using the NICMOS instrument on the Hubble Space Telescope. The emergent spectrum contains significant modulation, which we attribute to the presence of molecular bands seen in absorption. We find that water (H2O), carbon monoxide (CO), and carbon dioxide (CO2) are needed to explain the observations, and we are able to estimate the mixing ratios for these molecules. We also find temperature decreases with altitude in the ~0.01 < P< ~1 bar region of the dayside near-infrared photosphere and set an upper limit to the dayside abundance of methane (CH4) at these pressures.
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