辐射行星的斯皮策光谱分析：水蒸气的证据？
Analysis of Spitzer Spectra of Irradiated Planets: Evidence for Water Vapor?
摘要：
已发表的凌日行星HD 209458 b和HD 189733 b的中红外光谱，是由斯皮策太空望远镜上的红外光谱仪（IRS）在二次日食期间获得的，主要是没有特征的。特别是这些流量比光谱不表现出预期的功能所产生的水蒸气吸收短向10微米。在这里，我们建议，在没有流量的变化，HD 189733 b的光谱数据是不一致的8 μ m的光度测定与斯皮策的红外线阵列相机（IRAC），也许是一个问题的迹象，具有挑战性的减少IRS光谱。IRAC点，以及先前发表的HD 189733 b的二次日食测光，与HD 189733 b的一维模型非常一致，该模型清楚地显示了由于水蒸气在出射光谱中的吸收。我们无法对HD 209458b的IRS数据得出确切的结论，但一维和三维大气模型预测的光谱与数据充分吻合，无需调整水丰度或依赖云不透明度。我们认为，一般良好的协议模型光谱和IRS光谱的棕矮星与大气温度相似，这些高度辐射的行星借给信心的建模过程。
英文摘要：
Published mid infrared spectra of transiting planets HD 209458b and HD 189733b, obtained during secondary eclipse by the InfraRed Spectrograph (IRS) aboard the Spitzer Space Telescope, are predominantly featureless. In particular these flux ratio spectra do not exhibit an expected feature arising from water vapor absorption short-ward of 10 um. Here we suggest that, in the absence of flux variability, the spectral data for HD 189733b are inconsistent with 8 um-photometry obtained with Spitzer's InfraRed Array Camera (IRAC), perhaps an indication of problems with the challenging reduction of the IRS spectra. The IRAC point, along with previously published secondary eclipse photometry for HD 189733b, are in good agreement with a one-dimensional model of HD 189733b that clearly shows absorption due to water vapor in the emergent spectrum. We are not able to draw firm conclusions regarding the IRS data for HD 209458b, but spectra predicted by 1D and 3D atmosphere models fit the data adequately, without adjustment of the water abundance or reliance on cloud opacity. We argue that the generally good agreement between model spectra and IRS spectra of brown dwarfs with atmospheric temperatures similar to these highly irradiated planets lends confidence in the modeling procedure.
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