论文标题
首次查看CRIRES+：性能评估和系外行星光谱
A First Look at CRIRES+: Performance Assessment and Exoplanet Spectroscopy
论文作者
论文摘要
事实证明，高分辨率光谱法是大气遥感系外行星的强大途径。最近，ESO委托VLT的Crires+高分辨率红外光谱仪。 CRIRES+是一种交叉分散的光谱仪，在近红外（0.95-5.3 $ $ m）上具有高吞吐量和宽波长覆盖率，旨在特别适合于大气表征外行星的大气表征。在这项工作中，我们报告了对系外行星光谱的CRIRES+性能的早期见解，并对数据减少程序进行了详细评估。由于仪器的新颖性，我们使用官方的CR2RES管道和我们的新定制管道进行了两种独立的数据减少策略。使用科学验证观察，我们发现Crires+的光谱分辨能力可以达到$ r \ gtrsim 100,000 $，以实现最佳观察条件。同样，我们发现信噪比（S/N）与所考虑的观测值的预期和经验估计是一致的。作为一个案例研究，我们将CRIRES+的首次应用于外部球星的大气表征 - 超热木星睫毛膏-1 b。我们分别以12.9和5.3的S/N在睫毛膏-1 B的大气中检测到CO和H $ _2 $ O，并且通过CO和H $ _2 $ O排放线揭示的温度反转，这是外部外部的第一个。与CO相比，我们发现CO和H $ _2 $ o的CO和H $ _2 $ O的组合组合为13.8，并且偏爱较低的H $ _2 $ o的丰度。我们的发现表明了Crires+的科学潜力，并突出了高分辨率大气相光谱的绝佳机会。
High-resolution spectroscopy has proven to be a powerful avenue for atmospheric remote sensing of exoplanets. Recently, ESO commissioned the CRIRES+ high-resolution infrared spectrograph at VLT. CRIRES+ is a cross-dispersed spectrograph with high throughput and wide wavelength coverage across the near-infrared (0.95-5.3 $μ$m), designed to be particularly suited for atmospheric characterisation of exoplanets. In this work, we report early insights into the performance of CRIRES+ for exoplanet spectroscopy and conduct a detailed assessment of the data reduction procedure. Because of the novelty of the instrument, we perform two independent data reduction strategies, using the official CR2RES pipeline and our new custom-built ExoRES pipeline. Using science verification observations we find that the spectral resolving power of CRIRES+ can reach $R \gtrsim 100,000$ for optimal observing conditions. Similarly, we find the signal-to-noise ratio (S/N) to be consistent with expected and empirical estimates for the observations considered. As a case study, we perform the first application of CRIRES+ to the atmospheric characterisation of an exoplanet - the ultra-hot Jupiter MASCARA-1 b. We detect CO and H$_2$O in the atmosphere of MASCARA-1 b at a S/N of 12.9 and 5.3, respectively, and a temperature inversion revealed through the CO and H$_2$O emission lines, the first for an exoplanet. We find a combined S/N of 13.8 for CO and H$_2$O together, with a preference for lower H$_2$O abundance compared to CO. Our findings demonstrate the scientific potential of CRIRES+ and highlight the excellent opportunity for high-resolution atmospheric spectroscopy of diverse exoplanets.
