Substantial outgassing of CO from comet Hale-Bopp at large heliocentric distance
Article Abstract:
CO emission from comet Hale-Bopp has been observed in quantities that indicate a very large outgassing rate. Its CO production rate is of the order of 2x10(super 28) molecules s(super -1). No other volatile species were detected, despite search for several. Thus, sublimation of CO is apparently responsible for the comet's current activity. Future observations are expected to reveal the beginnings of sublimation of other volatile species as Hale-Bopp heads towards the Sun to examine the mechanisms of cometary activity.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Putting the CO in coma
Article Abstract:
Infrared investigations of carbon monoxide (CO) emission from comet Hale-Bopp over a range of distances from the Sun have shown that cometary CO comes 50% from the nucleus and 50% from a distributed source in the cometary atmosphere. The distributed sources switch off at a certain distance from the Sun, indicating a thermal production process. It may be possible to identify beyond doubt the distributed sources of volatiles in the coma by direct sampling of comets in future space missions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Episodic outgassing as the origin of atmospheric methane on Titan
Article Abstract:
Titan, Saturn's largest moon, has a large nitrogen atmosphere containing upto 5% methane near its surface but the origin of methane is not known. It is proposed that the episodic outgassing of methane stored as clathrate hydrates within an icy shell above an ammonia-enriched water ocean is the most likely explanation of presence of methane in the Titan's atmosphere.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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