Comment on ``Is the D/H ratio in the comet coma equal to the D/H ratio in the comet nucleus?'' by M. Podolak, Y. Mekler, and D. Prialnik

Details Comment on ``Is the D/H ratio in the comet coma equal to the D/H ratio in the comet nucleus?'' by M. Podolak, Y. Mekler, and D. Prialnik Comment on ``Is the D/H ratio in the comet coma equal to the D/H ratio in the comet nucleus?'' by M. Podolak, Y. Mekler, and D. Prialnik

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..168..220k&link_type=abstract

Icarus, Volume 168, Issue 1, p. 220-220.

Physics

Scientific paper

In a recent Icarus note, Podolak et al. (2002, Icarus 160, 208-211) proposed a model, which results in a significant enrichment in the D/H ratio in the coma relative to that in the comet nucleus. This conclusion contradicts to the typical HDO/H2O ice-vapor fractionation, with a smaller or equal D/H in the vapor. It is based on an error in the relationship for sublimation flux, which adversely affects all conclusions of Podolak et al. (2002, Icarus 160, 208-211). Due to the very low diffusion in the H2O ice, the HDO/H2O ratio in the coma should closely match this ratio in the nucleus.

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