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Related Experiment Videos

Infrared emission from comets.

K S Krishna-Swamy1, S A Sandford, L J Allamandola

  • 1NASA/Ames Research Center, Moffett Field, California, USA.

The Astrophysical Journal
|May 1, 1989
PubMed
Summary
This summary is machine-generated.

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Infrared observations reveal comet dust properties depend on heliocentric distance. A model using silicate and carbon grains accurately predicts thermal emission and spectral features for several comets.

Area of Science:

  • Astronomy
  • Planetary Science
  • Astrophysics

Background:

  • Cometary infrared emission is crucial for understanding dust composition and physical properties.
  • Heliocentric distance significantly influences the observed infrared spectra of comets.

Purpose of the Study:

  • To analyze infrared observations (4-20 micrometers) of seven comets.
  • To model cometary dust grain populations and their thermal emission.
  • To investigate the relationship between heliocentric distance and infrared emission features.

Main Methods:

  • Applied a model of silicate and amorphous carbon grain mixtures with a power-law size distribution.
  • Compared model predictions to infrared observations of comets West, Halley, IRAS-Araki-Alcock, and Kohoutek.
Keywords:
NASA Center ARCNASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program Exobiology

Related Experiment Videos

  • Analyzed the heliocentric variation of the 10 micrometer feature and overall thermal emission.

    • Main Results:

    • The model successfully matched the heliocentric variation of the 10 micrometer feature and thermal emission for comets West and Halley.
    • Slightly larger grains were required to match observations for comet IRAS-Araki-Alcock and the antitail of comet Kohoutek.
    • A qualitative fit was achieved for the 3.4 micrometer feature in comet Halley, with predictions for continuum emission sources.

    Conclusions:

    • Cometary dust grain properties, including size and composition, can be inferred from infrared observations.
    • The 4-8 micrometer spectral region is optimal for estimating cometary grain temperature distributions.
    • Heliocentric distance is a primary factor governing cometary infrared emission and dust behavior.