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arXiv 2008.04044astro-ph.EP
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用Na I和K I线探测HD189733b的大气

Probing the atmosphere of HD189733b with the Na I and K I lines

E. Keles, D. Kitzmann, M. Mallonn, X. Alexoudi, L. Fossati, L. Pino, J. V. Seidel, T. A. Carroll, M. Steffen, I. Ilyin, K. Poppenhaeger, K. G. Strassmeier, C. v… 展开作者

E. Keles, D. Kitzmann, M. Mallonn, X. Alexoudi, L. Fossati, L. Pino, J. V. Seidel, T. A. Carroll, M. Steffen, I. Ilyin, K. Poppenhaeger, K. G. Strassmeier, C. von Essen, V. Nascimbeni, J. D. Turner

摘要:

高光谱分辨率透射光谱学是表征系外行星大气的有力工具。特别是对于热蒸发器,这种技术是高度相关的,因为它们的高海拔吸收,例如来自共振钠(Na I)和钾(K I)线。我们解析了HD 189733 b的大气KI吸收,目的是将解析的KI线和先前获得的高分辨率Na I-D线观测与合成透射光谱进行比较。线的轮廓表明大气过程导致的Na I-D线的10公里/秒的数量级的线加宽,只有几公里/秒的K I线。研究表明,要么HD 189733 b的大气缺乏大量的KI,要么碱线探测不同温度的不同大气区域,这可以解释我们在分辨吸收线中看到的差异。

英文摘要:

High spectral resolution transmission spectroscopy is a powerful tool to characterize exoplanet atmospheres. Especially for hot Jupiters, this technique is highly relevant, due to their high altitude absorption e.g. from resonant sodium (Na I) and potassium (K I) lines. We resolve the atmospheric K I-absorption on HD189733b with the aim to compare the resolved K I -line and previously obtained high resolution Na I-D-line observations with synthetic transmission spectra. The line profiles suggest atmospheric processes leading to a line broadening of the order of 10 km/s for the Na I-D-lines, and only a few km/s for the K I-line. The investigation hints that either the atmosphere of HD189733b lacks a significant amount of K I or the alkali lines probe different atmospheric regions with different temperature, which could explain the differences we see in the resolved absorption lines.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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