Biologic Versus Abiotic Models of Cometary Grains

Details Biologic Versus Abiotic Models of Cometary Grains Biologic Versus Abiotic Models of Cometary Grains

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238.1165w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 238, 1165-1170. Article.

Astronomy and Astrophysics

Astronomy

6

Comets, Grains, Models, Organic Material, Infrared, Spectroscopy, Size, Spectra, Temperature, Halley, Comparisons, Parameters, Microorganisms, Abundance, Formation, Origin, Laboratory Studies, Hypotheses

Scientific paper

The infrared spectral feature around 3.4 μm observed in comet Halley is indicative of organic material, as shown to lowest order by transmission layer calculations. The detailed profile of the waveband emitted by grains of dust depends, however, on their sizes and temperatures. Radiatively processed methane-ice shows a 3.4- μm feature as would be expected. But, contrary to a recent claim for the `tholin' model, this differs significantly from the observed spectrum. New calculations for a size-distribution of realistic grains of biotic material give quite a close fit, confirming this is a good candidate for the complex organic material detected by the comet Halley probes.

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