rat4com: a radiative transfer model for water in comets

Details rat4com: a radiative transfer model for water in comets rat4com: a radiative transfer model for water in comets

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..465b&link_type=abstract

In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A

Physics

2

Comets: General, Radiative Transfer, Methods: Numerical, Radio Lines: Solar System

Scientific paper

We present an improved version of rat4com, a radiation transfer model for water rotational line emission in cometary coma. The original model is limited to the rotational transitions of ortho-water for a comet with a constant water production rate (Bensch & Bergin, 2004). With the improved version of rat4com we include para-water levels and study the impact of newer, more accurate water-electron collision rates on the predicted line emission. Additionally, we present results for a model where the water production rate is temporarily elevated. It is an initial attempt to model the emission of a comet undergoing an outburst. The prospects of water rotational line observations with HIFI on the Herschel Space Observatory are discussed.

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