HD 189733 b近红外昼侧光谱的分子特征
Molecular Signatures in the Near Infrared Dayside Spectrum of HD 189733b
摘要：
我们使用哈勃太空望远镜上的NICMOS仪器测量了HD 189733 b在1.5和2.5微米之间的昼侧光谱。出射光谱包含显着的调制，我们归因于在吸收中看到的分子带的存在。我们发现需要水（H2O），一氧化碳（CO）和二氧化碳（CO2）来解释这些观察结果，并且我们能够估计这些分子的混合比。我们还发现，在向阳面近红外光球的~0.01 < P < ~1 bar区域，温度随高度的增加而降低，并在这些压力下设定了向阳面甲烷（CH 4）丰度的上限。
英文摘要：
We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 microns 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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