A variationally computed line list for hot NH3

TL;DR

The paper introduces 'BYTe', a comprehensive variationally computed line list for hot ammonia (NH3), enabling accurate modeling of its spectral features at temperatures up to 1500K for astrophysical applications.

Contribution

It presents a new, extensive hot NH3 line list computed variationally using TROVE, with improved accuracy and coverage for astrophysical modeling.

Findings

Contains over 1.1 billion transitions

Accurately matches laboratory data

Suitable for modeling exoplanet and brown dwarf atmospheres

Abstract

We present 'BYTe', a comprehensive 'hot' line list for the ro-vibrational transitions of ammonia, 14NH3, in its ground electronic state. This line list has been computed variationally using the program suite TROVE, a new spectroscopically-determined potential energy surface and an ab initio dipole moment surface. BYTe, is designed to be used at all temperatures up to 1500K. It comprises 1137650964 transitions in the frequency range from 0 to 12000 cm-1, constructed from 1366519 energy levels below 18000 cm-1 having J values below 36. Comparisons with laboratory data confirm the accuracy of the line list which is suitable for modelling a variety of astrophysical problems including the atmospheres of extrasolar planets and brown dwarfs.