New study of the line profiles of sodium perturbed by H2
New study of the line profiles of sodium perturbed by H2
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DOI：
10.1051/0004-6361/201935593
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发表时间：
2019-08-15
影响因子：
6.5
通讯作者：
Molliere, P.
中科院分区：
文献类型：
--
作者：
Allard, N. F.;Spiegelman, F.;Molliere, P.
碱原子的不透明度，最重要的是Na和K，在褐矮星和系外行星的大气中起着至关重要的作用。我们提出了一个全面的研究Na-H-2碰撞配置文件的温度从500至3000 K，温度普遍存在于大气中的褐矮星和大质量行星。相关的H-2扰动密度在热的（T-eff大于或接近1500 K）冥王星质量的行星中达到几个10（19）cm（-3），对于更大质量或更冷的物体可以超过10（20）cm（-3）。准确的压力加宽的配置文件是有效的，在高密度的H-2应纳入光谱模型。用半经典方法计算了钠分子受氢分子扰动的统一分布。本文介绍了新的Na-H-2碰撞谱及其对用petitCODE计算的棕矮星和热矮星合成谱的影响。
The opacity of alkali atoms, most importantly of Na and K, plays a crucial role in the atmospheres of brown dwarfs and exoplanets. We present a comprehensive study of Na-H-2 collisional profiles at temperatures from 500 to 3000 K, the temperatures prevailing in the atmosphere of brown dwarfs and Jupiter-mass planets. The relevant H-2 perturber densities reach several 10(19) cm(-3) in hot (T-eff greater than or similar to 1500 K) Jupiter-mass planets and can exceed 10(20) cm(-3 )for more massive or cooler objects. Accurate pressure-broadened profiles that are valid at high densities of H-2 should be incorporated into spectral models. Unified profiles of sodium perturbed by molecular hydrogen were calculated in the semi-classical approach using up-to-date molecular data. New Na-H-2 collisional profiles and their effects on the synthetic spectra of brown dwarfs and hot Jupiters computed with petitCODE are presented.