Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..293b&link_type=abstract
Astrophysics and Space Science, vol. 46, Feb. 1977, p. 293-300.
Astronomy and Astrophysics
Astrophysics
12
Atmospheric Models, Mars Atmosphere, Planetary Evolution, Primitive Earth Atmosphere, Rare Gases, Venus Atmosphere, Chemical Composition, Degassing, Impact, Planetary Atmospheres
Scientific paper
It is generally supposed that the atmospheres of the terrestrial planets were formed by secondary degassing processes. This paper proposes, instead, that they are of primary origin, forming as an immediate and necessary consequence of the final stages of planetary accretion. Once the planetary embryo reached a critical size, the impacting material began to vaporize. The atmosphere so created then decelerated other impacting material, thus limiting the rate of atmospheric growth. It is shown that, given reasonable assumptions concerning the chemical composition of the impacting material, an acceptable model results for the early atmosphere of earth and the present atmospheres of Venus and Mars. A discussion of the noble-gas data for the terrestrial atmosphere indicates that these can be readily reconciled with an impact origin.
Benlow Anne
Meadows Jack A.
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