Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2814h&link_type=abstract
American Astronomical Society, DPS meeting #42, #28.14; Bulletin of the American Astronomical Society, Vol. 42, p.962
Astronomy and Astrophysics
Astronomy
Scientific paper
Cometary ices consist of H2O, CO2, CO and various molecular species such as NH3, CH4, and HCN. H2O is the most abundant species of cometary ice, and both CO2 and CO are also abundant. However, CO2 cannot be observed by ground-based observations and it is little known about the abundance of CO2 in comets because CO2 is severely absorbed by CO2 in the telluric atmosphere.
We carried out the near-infrared low-dispersion spectroscopic observations by Japanese infrared satellite AKARI. We observed 13 comets by the InfraRed Camera (IRC) with grism, which can cover the wavelength range from 2.5 to 5µm where vibrational fundamental bands of H2O, CO2 and CO (at 2.7, 4.3, and 4.7µm, respectively) are recognized as emission in cometary spectra. We determined the mixing ratios of CO2 and CO relative to H2O in 13 comets. We will discuss about the diversity of the mixing ratios of CO2 and CO in comets and compare our results with previous studies.
AKARI MP-SOSOS Team
AKARI/IRC Team
Hamada Saki
Kawakita Hideyo
Kobayashi Hirotada
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