Survey of CO2 in 18 comets with the Japanese Infrared Satellite AKARI

Details Survey of CO2 in 18 comets with the Japanese Infrared Satellite AKARI Survey of CO2 in 18 comets with the Japanese Infrared Satellite AKARI

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..369o&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.369

Physics

Scientific paper

We performed the survey of cometary volatiles by the Japanese Infrared satellite AKARI with the Infrared Camera (IRC) in the wavelength range from 2.5 - 5 μm from 2008 to 2009. In our survey, both Oort-cloud comets and Jupiter-family comets were observed, and observations were carried out twice or more in some cases. Most prominent emission bands were the fundamental vibrational bands of water (H2O) at 2.7 μm and carbon dioxide (CO2) at 4.3 μm in our spectra. The fundamental vibrational band of carbon monoxide (CO) at 4.7 μm was also recognized in some comets as well as broad emission features probably related to C-H bearing molecules around 3.4 - 3.5 μm region. Especially, CO2 in comets can be observed from the space only. Our dataset provides the largest and homogeneously analyzed database of CO2/H2O ratios in comets at present. The mixing ratios of CO2 span from a few to ~30 % among the comets.

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