使用AESOPUS 2.0实现低温气体不透明度
Low-Temperature Gas Opacities with AESOPUS 2.0
摘要：
这项工作介绍了新的低温气体不透明度，在3.2 <= log（T/K）<= 4.5的范围内，在热力学平衡的假设下使用AESOPUS代码计算（Marigo &_Aringer_2009）。与之前的版本AESOPUS 1.0相比，我们更新并扩展了分子吸收，以包括80种物质，主要使用目前可从ExoMol和HITRAN数据库获得的推荐行列表。此外，根据最近的研究，我们修改了H-光剥离截面，增加了原子和分子的其他负离子的自由-自由吸收，并更新了由于H2/H2，H2/H，H2/He和H/He对的碰撞诱导吸收。使用新的输入物理，我们计算了几种定标太阳化学成分的Rosseland平均不透明度表，包括Magg等人（2022）的最新一种，以及α增强的混合物。讨论了新AESOPUS 2.0和原始AESOPUS 1.0版本之间的不透明度差异以及其他计算集。新的不透明度通过一个专门的网页发布给社区，该网页包括广泛使用的化学成分的预先计算的表格，以及用于计算任何丰度分布的不透明度的网络界面。
英文摘要：
This work introduces new low-temperature gas opacities, in the range 3.2 <= log(T/K) <= 4.5, computed with the AESOPUS code under the assumption of thermodynamic equilibrium (Marigo &_Aringer_2009). In comparison to the previous version AESOPUS 1.0, we updated and expanded molecular absorption to include 80 species, mostly using the recommended line lists currently available from the ExoMol and HITRAN databases. Furthermore, in light of a recent study, we revised the H- photodetachment cross section, added the free-free absorption of other negative ions of atoms and molecules, and updated the collision-induced absorption due to H2/H2, H2/H, H2/He, and H/He pairs. Using the new input physics, we computed tables of Rosseland mean opacities for several scaled-solar chemical compositions, including Magg et al. (2022)'s most recent one, as well as alpha-enhanced mixtures. The differences in opacity between the new AESOPUS 2.0 and the original AESOPUS 1.0 versions, as well as other sets of calculations, are discussed. The new opacities are released to the community via a dedicated web-page that includes both pre-computed tables for widely used chemical compositions, and a web-interface for calculating opacities on-the-fly for any abundance distribution.
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