Spectroscopic study of the outer atmosphere of the exoplanet HD 189733 b

我建议在一篇论文的框架内，用高分辨率光谱学来研究热木星HD 189733 b的大气。已知的太阳系外行星系统的数量不断增加，揭示了各种各样的行星，它们的质量、密度、轨道构型不同，因此，很可能也非常不同的大气。近距离运行的木星行星--热木星--是令人惊讶的发现之一。这项应用旨在探测和分析热木星HD 189733 b的大气，这颗行星从大约1000颗已知的明亮而活跃的主恒星的系外行星中脱颖而出。计划中的研究基于一组大约250个高分辨率光谱，这是我在2013年7月1日使用UVES光谱仪获得的。此外，来自ESO和Keck档案的两个数据集还没有进行大气吸收分析，在数据简化后，将通过分析CaII H和K和H-α线来检测行星大气。此外，还需要对OUT数据覆盖的耀斑进行分析，特别是关于大气质量损失。尽管对HD 189733 b大气的探测已经发表了一些成果，但大气吸收的强度仍然存在争议。因为大部分相关的高能辐射可能是在耀斑期间释放出来的，所以很可能会出现一个时变的大气。因此，为了更好地了解HD 189733 B的大气和质量损失，进一步的大气吸收测量是必不可少的。我们数据的极高的光度稳定性允许在分析中包括凌日的颜色相关性。这既提供了研究活动主星中心到边缘变化的可能性，也提供了研究吸收中的行星大气的另一种方法。随着已知行星的不断增加，需要研究的大气也越来越多。

I propose to study the atmosphere of the hot Jovian planet HD 189733 b using high-resolution spectroscopy in the frame of a dissertation. The continuously increasing number of known extrasolar planetary systems reveals an enormous variety of planets with different masses, densities, orbital configurations and, therefore, most likely also highly dissimilar atmospheres. Jovian planets orbiting in close proximity to their host-stars - the hot Jupiters - are among the surprising discoveries.This application aims at the detection and analysis of the atmosphere of the hot Jovian planet HD 189733 b, which stands out from the roughly one thousand known exoplanets for its bright and active host star. The planned study is based on a set of ca. 250 high-resolution spectra, which I obtained on July 1st, 2013 using the UVES spectrograph. Furthermore, two data sets from the ESO- and KECK-archive are available, which have not yet been analyzed with respect to atmospheric absorption.After the data reduction, the planetary atmosphere shall be detected through the analysis of the Ca II H and K and H-alpha lines. Moreover, a flare covered by out data is to be analyzed, in particular with respect to atmospheric mass loss. Although a number of detections of HD 189733 b's atmosphere have been published already, the strength of the atmospheric absorption remains controversial.Because a major fraction of the relevant high-energy emission is potentially released during flares, a temporally variable atmosphere seems likely. Consequently, further measurements of atmospheric absorption are indispensable to better understand the atmosphere and mass loss of HD 189733 b.The extraordinarily high photometric stability of our data allows to include the color dependence of the transit in the analysis. This provides both a possibility to study the center-to-limb variation of the active host-star and another approach to study the planetary atmosphere in absorption.A continuously growing number of known planets ensues an increasing number of atmospheres to be studied.