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Is the D/H Ratio in the Comet Coma Equal to the D/H Ratio in the Comet Nucleus?

✍ Scribed by M. Podolak; Y. Mekler; D. Prialnik

Book ID
102572598
Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
79 KB
Volume
160
Category
Article
ISSN
0019-1035

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✦ Synopsis

We present a simple, semianalytic model of the vaporization of H 2 O and HDO ice from a comet nucleus. We use this model to show that the flux of HDO relative to H 2 O can be much higher, at times, than would be expected from the D/H ratio in the nuclear ice itself. This effect varies with position in the comet's orbit. It is negligible sufficiently near the Sun but could lead to erroneous interpretations of the primordial D/H ratio in cometary ice if measurements are made in other parts of the cometary orbit.

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