Deep within stellar cores and planetary atmospheres, photons wage an epic battle against matter, their journey dictated by opacity - how effectively atoms and molecules absorb, scatter, and redirect electromagnetic radiation. Understanding this cosmic tug-of-war is crucial for modeling everything from stellar evolution to exoplanet atmospheres, yet creating accurate opacity tables that align with your equation of state has been a persistent challenge in computational astrophysics.
OPTAB emerges as a comprehensive Fortran90 solution that transforms user-provided chemical equilibrium abundances into both mean and monochromatic opacity tables. This isn’t just another physics package - it’s a meticulously crafted toolkit incorporating atomic lines from Kurucz, molecular data from HITRAN and ExoMol, photoionization cross-sections from multiple authoritative sources, and scattering processes from Thomson to Rayleigh. The code handles everything from hydrogen’s negative ion absorption to collision-induced absorption, ensuring your radiation hydrodynamics simulations rest on a foundation of consistent, physically accurate opacity data.
Whether you’re modeling stellar interiors, protoplanetary disks, or atmospheric escape from hot Jupiters, OPTAB provides the precision needed for cutting-edge astrophysical research. Its modular design and extensive database integration make it invaluable for researchers pushing the boundaries of computational astrophysics, particularly those working on multi-dimensional radiation-magnetohydrodynamics simulations where opacity-equation of state consistency can make the difference between breakthrough science and numerical artifacts.
⭐ Stars: 19
💻 Language: Fortran
🔗 Repository: nombac/optab