Comparison of the Organic Composition of Cometary Samples with Residues Formed from the UV Irradiation of Astrophysical Ice Analogs

Details Comparison of the Organic Composition of Cometary Samples with Residues Formed from the UV Irradiation of Astrophysical Ice Analogs Comparison of the Organic Composition of Cometary Samples with Residues Formed from the UV Irradiation of Astrophysical Ice Analogs

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11a1199n&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P11A-1199

Biology

[5200] Planetary Sciences: Astrobiology, [6020] Planetary Sciences: Comets And Small Bodies / Ices, [6040] Planetary Sciences: Comets And Small Bodies / Origin And Evolution, [6060] Planetary Sciences: Comets And Small Bodies / Radiation And Chemistry

Scientific paper

We present C-, N-, and O-XANES (X-ray Absorption Near-Edge Spectroscopy) results of organic residues produced in the laboratory from the UV irradiation of astrophysical ice mixture analogs containing H2O, CO, CH3OH, NH3, and/or naphthalene (C10H8), and/or hexane (C6H14), in order to mimic processes that may occur in cold icy bodies of the outer Solar System, particularly comets. Such analyses showed that laboratory-formed organic residues mainly consist of a solid phase and an oily phase. C-XANES analysis of the solid phase suggests a rich distribution of organic functionalities, among which carbonyl, C=C, and alcohols, whereas N-XANES spectra indicate the possible presence of amide, amine, and nitrile groups. O-XANES spectra confirmed the O-bearing groups. These results are compared with the XANES spectra obtained from cometary samples.

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