@article{Raghuram:2016:2/102,
author = {Raghuram, S and Bhardwaj, A and Galand, M},
doi = {2/102},
journal = {Astrophysical Journal},
title = {Prediction of forbidden ultraviolet and visible emissions in comet 67P/Churyumov-Gerasimenko},
url = {http://dx.doi.org/10.3847/0004-637X/818/2/102},
volume = {818},
year = {2016}
}

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TY  - JOUR
AB  - Remote observation of spectroscopic emissions is a potential tool for theidentification and quantification of various species in comets. CO Cameron band(to trace \cod) and atomic oxygen emissions (to trace H$_2$O and/or CO$_2$, CO)have been used to probe neutral composition in the cometary coma. Using acoupled-chemistry emission model, various excitation processes controlling COCameron band and different atomic oxygen and atomic carbon have been modelledin comet 67P-Churyumov-Gerasimenko at 1.29~AU (perihelion) and at 3~AUheliocentric distances, which is being explored by ESA's Rosetta mission. Theintensities of CO Cameron band, atomic oxygen and atomic carbon emission linesas a function of projected distance are calculated for different CO and CO$_2$volume mixing ratios relative to water. Contributions of different excitationprocesses controlling these emissions are quantified. We assess how CO$_2$and/or CO volume mixing ratios with respect to H$_2$O can be derived based onthe observed intensities of CO Cameron band, atomic oxygen, and atomic carbonemission lines.The results presented in this work serve as base linecalculations to understand the behaviour of low out-gassing cometary coma andcompare them with the higher gas production rate cases (e.g. comet Halley).Quantitative analysis of different excitation processes governing thespectroscopic emissions is essential to study the chemistry of inner coma andto derive neutral gas composition.
AU  - Raghuram,S
AU  - Bhardwaj,A
AU  - Galand,M
DO  - 2/102
PY  - 2016///
SN  - 1538-4357
TI  - Prediction of forbidden ultraviolet and visible emissions in comet 67P/Churyumov-Gerasimenko
T2  - Astrophysical Journal
UR  - http://dx.doi.org/10.3847/0004-637X/818/2/102
UR  - http://hdl.handle.net/10044/1/29389
VL  - 818
ER  - 

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