Abstract
ABSTRACT A new hot line list for 14NH3 is presented. The line list CoYuTe was constructed using an accurate, empirically refined potential energy surface and a CCSD(T)/aug-cc-pVQZ ab initio dipole moment surface of ammonia, previously reported. The line list is an improvement of the ammonia line list BYTe. The CoYuTe line list covers wavenumbers up to 20 000 cm−1, i.e. wavelengths beyond 0.5 μm for temperatures up to 1500 K. Comparisons with the high temperature experimental data from the literature show excellent agreement for wavenumbers below 6000 cm−1. The CoYuTe line list contains 16.9 billion transitions and is available from the ExoMol website (www.exomol.com) and the CDS data base.
Highlights
A new hot line list for 14 NH3 is presented
Its spectral signature has long been observed in the atmospheres of Jupiter, Saturn, and Titan (Woodman, Trafton & Owen 1977)
This paper presents a new line list for hot ammonia called
Summary
Ammonia is the major nitrogen-containing molecule observable in a number of astrophysical environments. Shoemaker–Levy 9 with Jupiter (Orton et al 1995) and recent analysis has shown ammonia absorption features in the visible spectrum of Jupiter (Irwin et al 2018) These features were poorly represented by data available in standard data bases but could be modelled using a preliminary version of the line list presented here (Irwin et al 2019). Modelling or interpreting the spectrum of hot or non-LTE ammonia requires a substantial quantity of laboratory data To this end a number studies of ammonia have been performed with the view of producing extensive line lists of spectroscopic transitions Ammonia (Tennyson & Yurchenko 2012), which aims to provide comprehensive line lists for studies of exoplanets and other hot or nonLTE atmospheres. The following sections detail the method used to compute the CoYuTe line list with particular emphasis on these improvements before discussing the final line list
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