ÆSOPUS 2.0: Low-temperature Opacities with Solid Grains

In this study we compute the equation of state and Rosseland mean opacity from temperatures of T similar or equal to 30,000 K down to T similar or equal to 400 K, pushing the capabilities of the ae SOPUS code into the regime where solid grains can form. The GGchem code is used to solve the chemistry for temperatures less than similar or equal to 3000 K. Atoms, molecules, and dust grains in thermodynamic equilibrium are all included in the equation of state. To incorporate monochromatic atomic and molecular cross sections, an optimized opacity sampling technique is used. The Mie theory is employed to calculate the opacity of 43 grain species. Tables of Rosseland mean opacities for scaled-solar compositions are provided. Based on our computing resources, opacities for other chemical patterns, as well as various grain sizes, porosities, and shapes, can be easily computed upon user request to the corresponding author.