The center-to-limb variation across the Fraunhofer lines of HD 189733; Sampling the stellar spectrum using a transiting planet

The center-to-limb variation across the Fraunhofer lines of HD 189733; Sampling the stellar spectrum using a transiting planet
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HD 189733 的夫琅和费线的中心到肢体的变化;

DOI:
10.1051/0004-6361/201526386
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发表时间:
2015
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
通讯作者:
Czesla
Czesla
中科院分区:
--
文献类型:
--
作者:
Czesla

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中心-边缘变化(CLV)描述了恒星盘的亮度作为边缘角的函数。在强吸收线上,CLV可以变化相当显著。我们获得了一个密集的采样时间序列的高分辨率过境光谱的活动行星主机星星HD 189733与UVES。利用热木星HD 189733 B的行星盘作为探测器,我们研究了Ca ii H和K以及Na i D1和D2 Fraunhofer谱线翼部的CLV,这些谱线不受活动引起的变率的强烈影响。与模型预测一致,我们的分析表明,研究的夫琅和费线的翅膀是临边增亮相对于(准)连续。CLV引起的效应的强度可以与热木星大气层的信号相同。因此,仔细处理强吸收线中恒星CLV的波长依赖性在行星凌日光谱学的解释中是高度相关的。
The center-to-limb variation (CLV) describes the brightness of the stellar disk as a function of the limb angle. Across strong absorption lines, the CLV can vary quite significantly. We obtained a densely sampled time series of high-resolution transit spectra of the active planet host star HD 189733 with UVES. Using the passing planetary disk of the hot Jupiter HD 189733 b as a probe, we study the CLV in the wings of the Ca ii H and K and Na i D1and D2Fraunhofer lines, which are not strongly affected by activity-induced variability. In agreement with model predictions, our analysis shows that the wings of the studied Fraunhofer lines are limb brightened with respect to the (quasi-)continuum. The strength of the CLV-induced effect can be on the same order as signals found for hot Jupiter atmospheres. Therefore, a careful treatment of the wavelength dependence of the stellar CLV in strong absorption lines is highly relevant in the interpretation of planetary transit spectroscopy.
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