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We have developed a public code, Optab, that outputs Rosseland, Planck, andtwo-temperature Planck mean gas opacity tables for radiation hydrodynamicssimulations in astrophysics. The code is developed for modern high-performancecomputing, being written in Fortran 90 and using Message Passing Interface andHierarchical Data Format, Version 5. The purpose of this work is to provide aplatform on which users can generate opacity tables for their own researchpurposes. Therefore, the code has been designed so that a user can easilymodify, change, or add opacity sources in addition to those alreadyimplemented, which include bremsstrahlung, photoionization, Rayleighscattering, line absorption, and collision-induced absorption. In this paper,we provide details of the opacity calculations in our code and presentvalidation tests to evaluate the performance of our code.

Optab: Public code for generating gas opacity tables for radiation hydrodynamics simulations