  In this study we compute the equation of state and Rosseland mean opacity
from temperatures of T~30000 K down to T~400 K, pushing the capabilities of the
AESOPUS code (Marigo et al., 2022; Marigo & Aringer, 2009) into the regime
where solid grains can form. The GGchem code (Woitke et al. 2018) is used to
solve the chemistry for temperatures less than ~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,
porosity, and shapes, can be easily computed upon user request to the
corresponding author.
