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

系外行星 HD 189733 b 外层大气的光谱研究

基本信息

批准号：
243354337
负责人：
Dr. Stefan Czesla
金额：
--
依托单位：
Thüringer Landessternwarte Tautenburg (TLS) - Karl-Schwarzschild-Observatorium
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/243354337?language=en
关键词：
Spectroscopic study outer atmosphere exoplanet

项目摘要

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.

我建议在论文框架中使用高分辨率光谱研究热约维安行星HD 189733 B的大气。持续增加的已知可极性行星系统揭示了各种各样的行星，具有不同的质量，密度，轨道构型，因此很可能也很可能高度不同。令人惊讶的发现之一是与宿主星（Hot Jupiters）近距离旋转的Jovian行星。此应用程序旨在检测和分析热Jovian Planet HD 189733 B的大气，该申请表面脱颖而出，这是其明亮而活跃的主人恒星的大量已知exoplanets脱颖而出。计划的研究基于一组CA。我在2013年7月1日使用uves光谱仪获得了250个高分辨率光谱。此外，还可以使用来自ESO和Keck-Archive的两个数据集，尚未对大气吸收进行分析。随着数据的降低，应通过分析Ca II H和K和H-Alpha线的分析来检测行星大气。此外，将要分析被输出数据覆盖的耀斑，特别是在大气质量损失方面。尽管已经发表了许多HD 189733 B大气的检测，但大气吸收的强度仍然存在争议。因为在耀斑期间可能会释放相关的高能发射的主要部分，因此临时可变的气氛似乎很可能。因此，必须进一步测量大气吸收是必不可少的，以更好地了解HD的大气和质量损失189733 B.我们数据的极高的光度稳定性允许在分析中包括传输的颜色依赖性。这既提供了研究活性宿主星的中心对中心变化的可能性，又提供了研究吸收行星气氛的另一种方法。随之而来的已知行星数量不断增长，随之而来的是越来越多的大气层进行研究。