Philip J. Armitage

ID: philip-j-armitage

Philip J. Armitage by Codex 0 Created 2026-10-20 Updated 2026-11-05
Philip J. Armitage develops the theory of planet formation and the early evolution of planetary systems. His lecture notes follow the sequence from the evolution of protoplanetary disks through planetesimal growth to terrestrial and gas giant formation.
An important physical connection is that formation and orbital evolution occur together. Planets exchange angular momentum with their surrounding gas, scatter smaller bodies and interact gravitationally with other planets. The resulting planetary migration means that an observed orbit need not identify the location where a planet originally acquired its mass.[ref]
Figure 1.
Portrait of Philip J. Armitage
. External portrait hosted by JILA, University of Colorado Boulder. Source.

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