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The HNC/HCN ratio in comets (1997)

Ferris, J. P. ; Lovell, A. J. ; Schloerb, F. P. ; [et al.]

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Publication Date: 2011-08-24

Description: The abundance ratio of the isomers HCN and HNC has been investigated in comet Hale-Bopp (C/1995 O1) through observations of the J = 4-3 rotational transitions of both species for heliocentric distances 0.93 〈 r 〈 3 AU, both pre- and post-perihelion. After correcting for the optical depth of the stronger HCN line, we find that the column density ratio of HNC/HCN in our telescope beam increases significantly as the comet approaches the Sun. We compare this behavior to that predicted from an ion-molecule chemical model and conclude that the HNC is produced in significant measure by chemical processes in the coma; i.e., for comet Hale-Bopp, HNC is not a parent molecule sublimating from the nucleus.

Keywords: Lunar and Planetary Science and Exploration

Type: Earth, moon, and planets (ISSN 0167-9295); Volume 78; 1-3; 29-35

Format: text

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