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Formation of Giant Planets

Stevenson, David J. (2004) Formation of Giant Planets. In: The Search for Other Worlds: Fourteenth Astrophysics Conference, College Park, MD, 13-14 October 2003. American Institute of Physics Conference Proceedings. No.713. American Institute of Physics , Melville, NY, pp. 133-141. ISBN 0-7354-0190-X http://resolver.caltech.edu/CaltechAUTHORS:STEaipcp04

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Abstract

This is a descriptive and non-mathematical summary of giant planet formation theories. There are two end-member models, core accretion and disk instability. In the core accretion model, several to ten Earth masses of solid (ice and rock) accumulate and this promotes subsequent gas accretion. In the disk instability model, a self-gravitating sphere of gas forms (somewhat analogous to star formation) and a core may arise through condensation and rainout from its low density envelope. The core accretion model may have a time-scale difficulty because the formation of the embryo and infall of gas is not fast relative to the time at which the gaseous disk is removed. The disk instability model suffers from the current theoretical inability to follow the development of these putative instabilities through to the formation of a planet. Observational data on core masses in Jupiter and Saturn do not clearly favor one model. However, the existence and nature of Uranus and Neptune strongly suggest that the formation of appropriate embryos occurs. Moreover, there is considerable flexibility in the elapsed time required to form Jupiter and Saturn by the core accretion model, including times of only a few million years, compatible with disk lifetimes. This suggests that core accretion remains the favored mode in our solar system. It is possible that both mechanisms operate in general and that many extrasolar planetary systems make use of the disk instability mode. Future theory and observations are essential for deciding this issue.


Item Type:Book Section
Additional Information:©2004 American Institute of Physics. Issue Date: June 24, 2004.
Subject Keywords:extrasolar planets, Earth, Jupiter, Saturn, Uranus, Neptune, accretion, circumstellar matter
Record Number:CaltechAUTHORS:STEaipcp04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:STEaipcp04
Alternative URL:http://dx.doi.org/10.1063/1.1774513
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9922
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Mar 2008
Last Modified:26 Dec 2012 09:54

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