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首页> 外文期刊>The Astrophysical journal >ON THE PRESENCE OF WATER AND GLOBAL CIRCULATION IN THE TRANSITING PLANET HD 189733b
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ON THE PRESENCE OF WATER AND GLOBAL CIRCULATION IN THE TRANSITING PLANET HD 189733b

机译：HD 189733b过渡行星中水的存在和全球循环

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摘要

Detailed models are compared to recent infrared observations of the nearby extrasolar planet HD 189733b. It is demonstrated that atmospheric water is present and that the planet's day side has a nonisothermal structure down to gas pressures of ～0.1 bars. Furthermore, model spectra with different amounts of CO are compared to the observations and an atmosphere absent of CO is excluded at roughly 2 σ. Constraining the CO concentration beyond that is unfortunately not possible with the current Spitzer photometry. However, radically enhanced (or depleted) metal abundances are unlikely and the basic composition of this planet is probably similar to that of its host star. When combined with Spitzer observations, a recent ground-based upper limit for the K-band dayside flux allows one to estimate the day-to-night energy redistribution efficiency to be ～43%.
机译：详细的模型与附近太阳系外行星HD 189733b的最新红外观测结果进行了比较。结果表明存在大气水，并且行星的日面在低至〜0.1 bar的气压下具有非等温结构。此外，将具有不同CO量的模型光谱与观测值进行了比较，排除了大约2σ处不存在CO的气氛。不幸的是，使用当前的Spitzer光度法无法将CO浓度限制在此范围之外。但是，根本不可能增强（或耗尽）金属丰度，并且该行星的基本组成可能与其所在恒星的相似。当结合Spitzer观测结果时，最近的K波段日边通量的地面上限允许人们估计白天至晚上的能量重新分配效率为〜43％。

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