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

Molecular Signatures in the Near Infrared Dayside Spectrum of HD 189733b