凌日行星HD 189733 b中水的存在和全球环流
On the Presence of Water and Global Circulation in the Transiting Planet HD 189733b
摘要：
详细的模型与最近对附近太阳系外行星HD 189733 b的红外观测进行了比较。它表明，大气层中存在水，并且行星的白天侧具有非等温结构，气体压力为~ 0.1 bar。此外，模型光谱与不同数量的CO进行比较的观测和大气中没有CO被排除在大约2西格玛。不幸的是，用目前的斯皮策测光法不可能将CO浓度限制在此之外。然而，从根本上增强（或耗尽）金属丰度是不可能的，这颗行星的基本成分可能与它的主星相似。结合斯皮策的观测，最近的K波段昼侧通量的地基上限允许人们估计昼夜能量再分配效率为~ 43%。
英文摘要：
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 non-isothermal 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-sigma. 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 day side flux allows one to estimate the day-to-night energy redistribution efficiency to be ~ 43%.
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