Analysis Of Spitzer IRS 5.6 To 7.7 μm Observations Of Comets 6P/d'Arrest And C/2007 N3 (Lulin)

Details Analysis Of Spitzer IRS 5.6 To 7.7 μm Observations Of Comets 6P/d'Arrest And C/2007 N3 (Lulin) Analysis Of Spitzer IRS 5.6 To 7.7 μm Observations Of Comets 6P/d'Arrest And C/2007 N3 (Lulin)

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715603h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #156.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The production rate of volatiles from comet nuclei through sublimation of ices is a measure of the activity and volatile abundance. Sublimation of water, the dominant ice in cometary bodies, is the main source of activity at heliocentric distances rh < 3 AU from the Sun. The water production rate (Q(H2O)), the rotational temperature (Trot) and the ortho-to-para ratio (OPR) are of particular interest in the study of cometary atmospheres and cometary physics, and cometary origins. We present Spitzer IRS 5.6 to 7.7 μm spectra of comets 6P/d'Arrest (6P) obtained 2008 Sept 12 UT (post-perihelion; rh = 1.39 AU), and C/2007 N3 (Lulin) obtained 2008 Oct 04 UT, (pre-perihelion; rh = 1.90 AU). The 6.3 μm ν2 vibrational band is detected in both comets. Both comets also show an as yet unidentified broad feature at 7.2 μm that appears in other IRS observations of comets. Fluorescence models of water emission are used to calculate Q(H2O), Trot, and OPR towards the nucleus of both comets and into the coma 9" and 18" away from the nucleus to assess the coma spatial distribution of Trot, and the OPR. Limits are placed on emission from controversial cometary constituents, carbonates and PAHs.
Support for this work is provided in part by NASA through contract 1355318.

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