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arXiv 2004.04160astro-ph.EP
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超级地球、暖海王星和热木星高分辨率光谱的分子截面

Molecular Cross Sections for High Resolution Spectroscopy of Super Earths, Warm Neptunes and Hot Jupiters

Siddharth Gandhi, Matteo Brogi, Sergei N. Yurchenko, Jonathan Tennyson, Phillip A. Coles, Rebecca K. Webb, Jayne L. Birkby, Gloria Guilluy, George A. Hawker, Ni… 展开作者

Siddharth Gandhi, Matteo Brogi, Sergei N. Yurchenko, Jonathan Tennyson, Phillip A. Coles, Rebecca K. Webb, Jayne L. Birkby, Gloria Guilluy, George A. Hawker, Nikku Madhusudhan, Aldo S. Bonomo, Alessandro Sozzetti

摘要:

高分辨率光谱学(HRS)已被用于检测高温大气中的一些物质。这种检测的关键是准确和精确地模拟光谱,用于与R $\gtrsim$ 20,000观测值的互相关。需要最新一代的不透明度,其形成使用这种光谱的高信噪比检测的基础。在这项研究中,我们提出并公开提供截面为六种分子,H $_2$ O,CO,HCN,CH $_4$,NH $_3$和CO $_2$使用最新的线列表最适合低和高分辨率光谱。我们重点研究了红外(0.95-5~ $μ$ m)和500-1500~K之间的光谱特征,这些物种具有较强的光谱特征。我们使用最新的H $_2$和He压力展宽,在超级地球、温暖的海王星和热的海王星的光球的典型压力和温度的网格上生成这些截面。我们通过模拟三颗具有代表性的系外行星GJ~1214~b、GJ~3470~b和HD~189733~b,突出了它们最突出的红外光谱特征,这三颗行星的温度、质量和半径都有很大的变化。此外,我们验证了线列表的H $_2$ O,CO和HCN与以前的高分辨率观测的热中子。然而,我们无法检测CH $_4$与我们的新的截面的HRS观测HD~102195~b。这些高精度的不透明度对于HRS的大气探测至关重要,并且将随着新数据的可用而不断更新。

英文摘要:

High resolution spectroscopy (HRS) has been used to detect a number of species in the atmospheres of hot Jupiters. Key to such detections is accurately and precisely modelled spectra for cross-correlation against the R$\gtrsim$20,000 observations. There is a need for the latest generation of opacities which form the basis for high signal-to-noise detections using such spectra. In this study we present and make publicly available cross sections for six molecular species, H$_2$O, CO, HCN, CH$_4$, NH$_3$ and CO$_2$ using the latest line lists most suitable for low- and high-resolution spectroscopy. We focus on the infrared (0.95-5~$μ$m) and between 500-1500~K where these species have strong spectral signatures. We generate these cross sections on a grid of pressures and temperatures typical for the photospheres of super Earth, warm Neptunes and hot Jupiters using the latest H$_2$ and He pressure broadening. We highlight the most prominent infrared spectral features by modelling three representative exoplanets, GJ~1214~b, GJ~3470~b and HD~189733~b, which encompass a wide range in temperature, mass and radii. In addition, we verify the line lists for H$_2$O, CO and HCN with previous high resolution observations of hot Jupiters. However, we are unable to detect CH$_4$ with our new cross sections from HRS observations of HD~102195~b. These high accuracy opacities are critical for atmospheric detections with HRS and will be continually updated as new data becomes available.

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