Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 690, Issue 2, Pages L114-L117Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/690/2/L114
Keywords
planetary systems; techniques: spectroscopic
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Funding
- UK Sciences & Technology Facilities Council
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We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 mu m 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 similar to 0.01 < P < similar to 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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