Infrared emission by organic grains in the coma of comet Halley

Details Infrared emission by organic grains in the coma of comet Halley Infrared emission by organic grains in the coma of comet Halley

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..350c&link_type=abstract

Nature (ISSN 0028-0836), vol. 330, Nov. 26, 1987, p. 350-353.

Astronomy and Astrophysics

Astronomy

32

Astronomical Spectroscopy, Coma, Halley'S Comet, Infrared Radiation, Organic Compounds, Abundance, Cosmic Dust, Emission Spectra, Ground Stations, Spaceborne Astronomy, Comets, Halley, Infrared, Wavelengths, Emissions, Organic Material, Grains, Comae, Laboratory Studies, Spectra, Residue, Experiments, Analogs, Simulations, Irradiation, Ice, Methane, Models, Dust, Optical Properties, Depth, Calculations, Comparisons

Scientific paper

Transmission spectra of organic residues produced by laboratory irradiation of cometary ices, which serve as a basis for a model of emitting cometary dust, are discussed. The laboratory synthesis of solid organic residue from irradiated low-occupancy methane ice clathrate simulates the radiation processing experienced by comet Halley. The transmission spectrum of this residue, convolved with a simple two-component thermal emission model based on the spacecraft-determined dust distribution in the Halley coma, fits the triple-peaked 3.4 micron emission feature observed in Halley which is characteristic of C-H stretching in hydrocarbons. It also provides optical depths in excellent agreement with those determined observationally and accounts for the absence of features at longer wavelengths.

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