The CARMENES search for exoplanets around M dwarfs Telluric absorption corrected high S/N optical and near-infrared template spectra of 382 M dwarf stars
The CARMENES search for exoplanets around M dwarfs Telluric absorption corrected high S/N optical and near-infrared template spectra of 382 M dwarf stars
复制标题
CARMENES 搜索 M 矮星周围的系外行星 大地吸收校正了 382 M 矮星的高信噪比光学和近红外模板光谱
DOI：
10.1051/0004-6361/202346524
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发表时间：
2023
影响因子：
6.5
通讯作者：
Nagel E
中科院分区：
文献类型：
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作者：
Nagel E
来自天体的光与地球大气层的分子相互作用，导致地面光谱数据中产生大地吸收线。校正这些强烈影响红色和红外波长的谱线，在各种各样的科学应用中经常需要。在这里，我们提出了模板划分大地建模（TDTM）技术，一种方法，用于准确地去除大地吸收线的恒星，表现出许多内在的功能。基于地球的重心运动，全年，我们的方法是适合于解开大地和恒星的光谱成分。通过拟合一个综合的传输模型，无碲光谱推导。我们证明了TDTM技术的性能，在纠正碲污染使用高分辨率的光学光谱时间序列的功能丰富的M3.0矮星星星沃尔夫294，获得与CARMENES摄谱仪。我们应用TDTM方法的CARMENES调查样本，其中包括382个目标，包括22 357光学和20 314近红外光谱，以纠正大地吸收。校正后的光谱被共同添加以构建每个目标的模板光谱。这一无大地元素、高信噪比、高分辨率（λ> 80 000）模板库包括迄今为止在数量和质量方面最全面的M矮星光谱数据集，可在项目网站上查阅。
Light from celestial objects interacts with the molecules of the Earth’s atmosphere, resulting in the production of telluric absorption lines in ground-based spectral data. Correcting for these lines, which strongly affect red and infrared wavelengths, is often needed in a wide variety of scientific applications. Here, we present the template division telluric modeling (TDTM) technique, a method for accurately removing telluric absorption lines in stars that exhibit numerous intrinsic features. Based on the Earth’s barycentric motion throughout the year, our approach is suited for disentangling telluric and stellar spectral components. By fitting a synthetic transmission model, telluric-free spectra are derived. We demonstrate the performance of the TDTM technique in correcting telluric contamination using a high-resolution optical spectral time series of the feature-rich M3.0 dwarf star Wolf 294 that was obtained with the CARMENES spectrograph. We apply the TDTM approach to the CARMENES survey sample, which consists of 382 targets encompassing 22 357 optical and 20 314 near-infrared spectra, to correct for telluric absorption. The corrected spectra are coadded to construct template spectra for each of our targets. This library of telluric-free, high signal-to-noise ratio, high-resolution (ℛ > 80 000) templates comprises the most comprehensive collection of spectral M-dwarf data available to date, both in terms of quantity and quality, and is available at the project website.