Modeling H2O and CO2 in Optically Thick Comets Using Asymmetric Spherical Coupled Escape Probability and Application to Comet C/2009 P1 Garradd Observations of CO, H2O, and CO2

Alan M. Gersch, Lori M. Feaga, and Michael F. A’Hearn1
Astrophysical Journal 854, 149 Link to Article [DOI: 10.3847/1538-4357/aa9795]
Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
1Deceased.

We have adapted Coupled Escape Probability, a new exact method of solving radiative transfer problems, for use in asymmetrical spherical situations for use in modeling optically thick cometary comae. Here we present the extension of our model and corresponding results for two additional primary volatile species of interest, H2O and CO2, in purely theoretical comets. We also present detailed modeling and results for the specific examples of CO, H2O, and CO2 observations of C/2009 P1 Garradd by the Deep Impact flyby spacecraft.

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