= Philip J. Armitage
{c}
<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>.<Lecture notes on the formation and early evolution of planetary systems by Philip J. Armitage>[Abstract and topical outline: disk evolution, planetesimal growth, migration, scattering and tides]{ref}
\Image[https://www.colorado.edu/jila/sites/default/files/styles/large_image_style/public/2025-05/Phil_Artimage_2016_web.jpg?itok=RbAcYOSn]
{title=Portrait of <Philip J. Armitage>}
{description=External portrait hosted by JILA, University of Colorado Boulder.}
{source=https://www.colorado.edu/jila/phil-armitrage}
{width=250}
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