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arXiv · 2012.08497

Dynamics of the CO+ coma of comet 29P/Schwasmann-Wachmann 1

O. Ivanova·O. Agapitov·D. Odstrcil·P. Korsun·V. Afanasiev·V. Rosenbush
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Abstract

Comet-centaur 29P/Schwassmann-Wachmann 1 was observed in CO+ emission and contin-uum during 2007-2009 using the 6-m Big Telescope Alt-azimuth at the Special Astrophysical Observatory of the Russian Academy of Sciences. We analysed the morphology of the CO+ and dust coma. The distributions of dust and CO+ ions in the coma are not similar and vary depending on the level of comet activity. CO+ ions are more concentrated towards the nucleus than the dust continuum. The column density of the CO+ was derived and found to vary from 3.7*10^9 to 4.3*10^10 ions cm^-2. The production rate of CO+ was estimated to be from (7.01)*10^24 to (1.15)*10^26 ions s^-1. We discuss possible mechanisms for the ionization of cometary material and show that impact ionization by solar wind particles is probably the main ionization mechanism at large heliocentric distances.

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O. Ivanova, O. Agapitov, D. Odstrcil, P. Korsun, V. Afanasiev, V. Rosenbush. 2020-12-15. Dynamics of the CO+ coma of comet 29P/Schwasmann-Wachmann 1. https://doi.org/10.1093/mnras/stz1200

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