Large Aperture O I 6300 Å Observations of Comet Hyakutake: Implications for the Photochemistry of OH and O I Production in Comet Hale-Bopp

Details Large Aperture O I 6300 Å Observations of Comet Hyakutake: Implications for the Photochemistry of OH and O I Production in Comet Hale-Bopp Large Aperture O I 6300 Å Observations of Comet Hyakutake: Implications for the Photochemistry of OH and O I Production in Comet Hale-Bopp

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...657.1162m&link_type=abstract

The Astrophysical Journal, Volume 657, Issue 2, pp. 1162-1171.

Astronomy and Astrophysics

Astronomy

5

Comets: Individual (Hale-Bopp), Comets: Individual (Hyakutake), Comets: Individual (Austin), Comets: Individual: Name: Halley, Instrumentation: Spectrographs, Molecular Data, Molecular Processes

Scientific paper

In previous work (Morgenthaler et al. and Glinski et al.), we proposed a revision to the standard OH photochemistry of van Dishoeck & Dalgarno in order to explain the anomalously bright [O I] 6300 Å emission observed by several instruments in comet C/1995 O1 (Hale-Bopp). In order to test the validity of revisions to the OH photochemistry, we present wide-field Fabry-Pérot [O I] 6300 Å observations of comet C/1996 B2 (Hyakutake) and review similar observations recorded for 1P/Halley and 1989 c1 (Austin). Conventional long-slit spectroscopic observations of several comets in [O I] are also reviewed. The bulk of the evidence suggests that the OH photochemical rates of van Dishoeck & Dalgarno are, on the whole, correct and that the bright [O I] emission observed in Hale-Bopp, particularly at cometocentric distances beyond ~3×104 km, was unique to that comet, or possibly any comet with such a large production rate.

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