论文标题
用Na I和K I线探测HD189733B的气氛
Probing the atmosphere of HD189733b with the Na I and K I lines
论文作者
论文摘要
高光谱分辨率传输光谱是表征系外行星气氛的强大工具。特别是对于热木星而言，由于其高海拔吸收，例如从共振钠（Na I）和钾（K I）线。我们解决了HD189733B上的大气K I-吸附，目的是比较已解决的K I线，并以前获得了高分辨率Na I-D-line观测值和合成传输光谱。线曲线表明，大气过程导致Na I-D线的10 km/s的线扩大，而K I线仅几km/s。研究暗示，要么HD189733B的大气缺乏大量的K I或碱系探针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。
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.
