Pre-perihelion observations of comet C/2017 K2 show increasing CH3OH line intensities with decreasing heliocentric distance, non-LTE dominated excitation, Tgas >100 K, and CH3OH/H2O ratio of 0.01-0.04.
Non-LTE radiative transfer for sub-millimeter water lines in Comet 67P/Churyumov-Gerasimenko
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Single-dish observations and non-LTE analysis of CH3OH, HCN, and CO line emission in the Oort cloud comet C/2017 K2 (PANSTARRS)
Pre-perihelion observations of comet C/2017 K2 show increasing CH3OH line intensities with decreasing heliocentric distance, non-LTE dominated excitation, Tgas >100 K, and CH3OH/H2O ratio of 0.01-0.04.