Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.1707r&link_type=abstract
American Astronomical Society, DPS meeting #31, #17.07
Astronomy and Astrophysics
Astronomy
Scientific paper
Ethane and carbon monoxide were detected in a short-period comet of probable Kuiper belt origin. Ethane is substantially less abundant in Giacobini-Zinner compared with Hyakutake and Hale-Bopp, two comets of probable origin in the giant planet's nebular region. This difference suggests the presence of a heliocentric gradient in ethane in pre-cometary ices of the solar nebula. It is argued that processing by X-rays from the young sun may be responsible. The detection of methanol within the normal range of cometary abundances (Biver et al. 1999) argues against a general depletion of organic volatiles in G-Z. The depletion of ethane in this quintessential C2-depleted comet suggests that ethane will be depleted in the 1/3 Jupiter-family comets identified as carbon-chain depleted by A'Hearn et al. 1995.
Dello Russo Neil
DiSanti Michael A.
Magee-Sauer Karen
Mumma Michael J.
Rettig Terrence
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