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Related Experiment Videos

Interstellar solid CO: polar and nonpolar interstellar ices.

A G Tielens1, A T Tokunaga, T R Geballe

  • 1Theoretical Studies Branch, NASA/Ames Research Center, CA 94035, USA.

The Astrophysical Journal
|November 1, 1991
PubMed
Summary
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Observations of solid carbon monoxide (CO) bands in protostars reveal two distinct ice components. These findings suggest variations in grain mantle composition and physical characteristics during star formation.

Area of Science:

  • * Astrochemistry
  • * Solid-state physics
  • * Protostellar evolution

Background:

  • * Interstellar ices are crucial for understanding star and planet formation.
  • * Solid carbon monoxide (CO) is a key tracer of ice composition in protostellar environments.
  • * Previous studies have identified solid CO features, but their complexity and origins remain debated.

Purpose of the Study:

  • * To investigate the spectral properties of solid CO in protostars using moderate-resolution observations.
  • * To identify and characterize distinct components within the solid CO band.
  • * To relate observed spectral variations to the composition and physical properties of interstellar ice mantles.

Main Methods:

  • * Moderate-resolution spectroscopy (lambda/delta lambda approximately 1200) of the solid CO band in protostars.
Keywords:
NASA Center ARCNASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program Exobiology

Related Experiment Videos

  • * Analysis of spectral features, including peak position and width, of solid CO components.
  • * Comparison of observed spectra with laboratory studies of astrophysically relevant ice mixtures.

    • Main Results:

    • * Two independent solid CO components were detected in most observed lines of sight.
    • * A narrow component (approximately 5 cm-1) centered at ~2140 cm-1 and a broader component (approximately 10 cm-1) at ~2136 cm-1 were identified.
    • * Variations in the peak position and width of the narrow component suggest differences in grain mantle composition and/or grain shape.
    • * The relative strengths of the two components varied significantly among the observed protostars.

    Conclusions:

    • * Interstellar grain mantles commonly consist of at least two independent components: a polar (H2O-rich) mixture and a nonpolar mixture.
    • * The nonpolar component is dominant in the solid CO spectrum, while the polar component is associated with other ice bands (e.g., 3.08 and 6.0 micrometers).
    • * These distinct mantle components likely reflect chemical variations during accretion and may be influenced by ice volatility around luminous protostars.