AI 中文总结
研究褐矮星物理条件下受氦气和氢气扰动的近红外K 4p-5s双峰，用统一线形理论计算谱线轮廓，发现其呈蓝色不对称，随气体密度增加效应更显著，还指出高扰动密度下碰撞近似失效。
AI 中文摘要
本文旨在详尽研究在褐矮星物理条件下，受氦气和氢气扰动的1.243/1.252~μm处的K 4p-5s双峰。该研究适用于分析ESO超木星调查的J波段光谱，如鲁曼16的光谱。在统一线形理论中计算出的该双峰的谱线轮廓呈现蓝色不对称行为。随着氦气和氢气密度增加，此效应愈发重要，对红外K双峰的全面处理揭示了其在碰撞近似之外对不透明度有强烈影响。当氦气和氢气扰动密度大于\(10^{19}\)~cm\(^{-3}\)（0.4 bar）时，碰撞近似失效，不适用于计算谱线轮廓形状及其线芯参数。
英文摘要
The goal of this paper is to provide an exhaustive study of the K 4p-5s doublet at 1.243/1.252~$μ$m perturbed by He and H$_2$ in physical conditions of brown dwarfs. This work is applicable to analysis of the ESO SupJup Survey's J-band spectra such as for Luhman~16. Line profiles of this doublet computed within a unified line-shape theory exhibit a blue asymmetrical behavior. This effect is of increasing importance with He and H2 density, and as a result, the full treatment of the infrared K doublet reveals strong effects on its opacity outside the impact approximation. For a He and H2 perturber density larger than $10^{19}$~cm$^{-3}$ (0.4 bar) the impact approximation breaks down and is not applicable to calculate the shape of the line profiles and their line core parameters.
