The ExoMolOP Database: Cross-sections and k-tables for Molecules of Interest in High-Temperature Exoplanet Atmospheres

TL;DR

The ExoMolOP database provides extensive high-temperature molecular opacity data, including cross-sections and k-tables, for over 80 species relevant to exoplanet atmospheres, formatted for multiple retrieval codes.

Contribution

This work compiles and formats a comprehensive, publicly accessible database of molecular opacities for exoplanet atmosphere modeling, integrating data from multiple sources and covering a wide temperature and pressure range.

Findings

Data suitable for high-temperature exoplanet atmospheres

Includes cross-sections and k-tables for 80+ molecules

Compatible with major atmospheric retrieval codes

Abstract

A publicly available database of opacities for molecules of astrophysical interest, ExoMolOP, has been compiled for over 80 species, based on the latest line list data from the ExoMol, HITEMP and MoLLIST databases. These data are generally suitable for characterising high temperature exoplanet or cool stellar/substellar atmospheres, and have been computed at a variety of pressures and temperatures, with a few molecules included at room-temperature only from the HITRAN database. The data are formatted in different ways for four different exoplanet atmosphere retrieval codes; ARCiS, TauREx, NEMESIS and petitRADTRANS, and include both cross-sections (at R~=~$\frac{\lambda}{\Delta \lambda}$~=~15,000) and k-tables (at R~=~$\frac{\lambda}{\Delta \lambda}$~=~1000) for the 0.3~-~50$\mu$m wavelength region. Opacity files can be downloaded and used directly for these codes. Atomic data for alkali metals Na and K are also included, using data from the NIST database and the latest line shapes for the resonance lines. Broadening parameters have been taken from the literature where available, or from those for a known molecule with similar molecular properties where no broadening data are available. The data are available from www.exomol.com.