Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom; and
Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom; and.
Proc Natl Acad Sci U S A. 2014 Jul 1;111(26):9379-83. doi: 10.1073/pnas.1324219111. Epub 2014 Jun 16.
Hot methane spectra are important in environments ranging from flames to the atmospheres of cool stars and exoplanets. A new spectroscopic line list, 10to10, for (12)CH4 containing almost 10 billion transitions is presented. This comprehensive line list covers a broad spectroscopic range and is applicable for temperatures up to 1,500 K. Previous methane data are incomplete, leading to underestimated opacities at short wavelengths and elevated temperatures. Use of 10to10 in models of the bright T4.5 brown dwarf 2MASS 0559-14 leads to significantly better agreement with observations and in studies of the hot Jupiter exoplanet HD 189733b leads to up to a 20-fold increase in methane abundance. It is demonstrated that proper inclusion of the huge increase in hot transitions which are important at elevated temperatures is crucial for accurate characterizations of atmospheres of brown dwarfs and exoplanets, especially when observed in the near-infrared.
热甲烷光谱在从火焰到冷恒星和系外行星大气的各种环境中都很重要。本文提出了一个新的（12）CH4 光谱线列表 10to10，其中包含近 100 亿条跃迁。这个全面的光谱线列表涵盖了广泛的光谱范围，适用于高达 1500 K 的温度。以前的甲烷数据不完整，导致在短波长和高温下低估了不透明度。在亮度为 T4.5 的褐矮星 2MASS 0559-14 的模型和对热木星系外行星 HD 189733b 的研究中使用 10to10，显著提高了与观测结果的一致性，并且在研究中甲烷丰度增加了 20 倍。研究表明，在高温下重要的大量热跃迁的正确包含对于准确描述褐矮星和系外行星的大气至关重要，特别是在近红外波段观测时。
