On the origin of HNC in Comet Lee

Details On the origin of HNC in Comet Lee On the origin of HNC in Comet Lee

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.323...84r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 323, Issue 1, pp. 84-92.

Astronomy and Astrophysics

Astronomy

23

Comets: General, Comets: Individual: Lee

Scientific paper

We have modelled the chemistry occurring in the coma of Comet Lee and have critically evaluated the possible routes leading to HNC. We show that the observed levels of HNC cannot be produced by ion-molecule chemistry, or by reactions of energetic H atoms with HCN. Rather, it appears that HNC is injected into the coma following the photodestruction of an unknown precursor. We discuss the possible nature of the parent of HNC and conclude that photofragmentation of large HCN polymers, such as polyaminocyanomethylene (PACM), is responsible. The degradation of hydrogen cyanide polymers may constitute a common source of HNC in comets, accounting for HNC/HCN ratios in the range measured in Lee and Hyakutake (~0.06-0.12). The high HNC/HCN ratio measured in Hale-Bopp (~0.2) and its heliocentric variation may, however, require an additional source.

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