Gas phase mean opacities for varying [M/H], N/O, and C/O

TL;DR

This paper provides comprehensive gas-phase opacity tables for various metallicities and element ratios, aiding simulations in astrophysics such as star and planet formation.

Contribution

It introduces new opacity tables covering a wide range of metallicities and element ratios, including C/O and N/O variations, for use in astrophysical modeling.

Findings

Opacity varies significantly with C/O, N/O, and metallicity.

Tables cover temperatures 1000K to 10000K and densities 10^2 to 10^17 cm^-3.

Results are applicable for diverse astrophysical environments.

Abstract

We present a set of gas-phase Planck mean and Rosseland mean opacity tables applicable for simulations of star and planet formation, stellar evolution, disk modelling at various metallicities in hydrogen-rich environments. The tables are calculated for gas temperatures between 1000K and 10000K and total hydrogen number densities between 10^2 cm^-3 and 10^17 cm^-3. The carbon-to-oxygen ratio is varied from 0.43 to well above 2.0, the nitrogen-to-oxygen ration between 0.14 and 100.0. The tables are calculated for a range of metallicities down to [M/H]'= log N_M/N_H=-7.0. We demonstrate how the mean opacities and the abundances of the opacity species vary with C/O, N/O, and [M/H]'. We use the element abundances from Grevesse, Asplund & Sauval (2007), and we provide additional tables for the oxygen-abundance value from Caffau et al.(2008). All tables will be available online under http://star-www.st-and.ac.uk/$\sim$ch80/datasources.html