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Comets, meteorites and atmospheres.

T Owen1, A Bar-Nun

  • 1Institute for Astronomy, University of Hawaii, Honolulu 96822, USA.

Earth, Moon, and Planets
|January 1, 1996
PubMed
Summary
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Meteorites likely did not deliver noble gases to inner planets. Comets, however, may be a significant source, according to laboratory experiments and a new atmospheric origin model.

Area of Science:

  • Planetary Science
  • Astrochemistry

Background:

  • The origin of noble gases in terrestrial planet atmospheres remains a key question in planetary science.
  • Xenon-to-Krypton (Xe/Kr) ratios in Earth and Mars atmospheres are relatively low, challenging meteorite delivery as the primary source.

Purpose of the Study:

  • To investigate alternative sources for noble gas delivery to the inner solar system.
  • To propose and test a new model for the origin of inner planet atmospheres.

Main Methods:

  • Analysis of Xe/Kr ratios in Earth and Mars atmospheres.
  • Laboratory experiments simulating gas trapping in ice at low temperatures.
  • Development of a model for planetary atmosphere formation.

Main Results:

Keywords:
NASA Discipline ExobiologyNon-NASA Center

Related Experiment Videos

  • Low Xe/Kr ratios in inner planets suggest meteorites are not the main noble gas carriers.
  • Laboratory experiments indicate comets are plausible reservoirs for noble gases.
  • A model incorporating cometary volatile delivery alongside primordial trapped volatiles is proposed.

    • Conclusions:

    • Comets are a more likely source of noble gases for inner planet atmospheres than meteorites.
    • The proposed model, integrating cometary and primordial volatiles, offers a viable explanation for inner planet atmospheric composition.
    • Further testing of the model using data from the Galileo Entry Probe is planned.