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Cometary Origin of Carbon and Water on the Terrestrial Planets

Published online by Cambridge University Press:  07 August 2017

A. H. Delsemme
A. H. Delsemme*
Affiliation:
DEPARTMENT OF PHYSICS & ASTRONOMY THE UNIVERSITY OF TOLEDO TOLEDO, OH 43606, U.S.A.

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The origin of carbon and water on the terrestrial planets is not trivial, because their presence seems to be excluded by the high temperatures requested by the accretion disk models (Morfill 1988) as well as by Lewis' (1973) adiabat that can explain the different densities of the planets. These high temperatures imply that all dust was outgassed and dehydrated and most carbon stored in CO, that is in the gas phase, before the separation of dust from gas, that occurred by dust sedimentation to the mid-plane of the accretion disk. Thermochemical equilibrium was easily reached, since chemical kinetics (Lewis & Prinn 1980) had time constants shorter than the time needed to agglomerate the first planetesimals (Weidenschilling 1988).

Type
Solar System
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 421 - 422
Copyright
Copyright © Kluwer 1992 

References

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