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Prior work has found that a variety of terrestrial planetary compositions areexpected to occur within known extrasolar planetary systems. However, suchstudies ignored the effects of giant planet migration, which is thought to bevery common in extra-solar systems. Here we present calculations of thecompositions of terrestrial planets that formed in dynamical simulationsincorporating varying degrees of giant planet migration. We used chemicalequilibrium models of the solid material present in the disks of five knownplanetary host stars: the Sun, GJ 777, HD4203, HD19994 and HD213240. Giantplanet migration has a strong effect on the compositions of simulatedterrestrial planets as the migration results large-scale mixing betweenterrestrial planet building blocks that condensed at a range of temperatures.This mixing acts to 1) increase the typical abundance of Mg-rich silicates inthe terrestrial planets feeding zones and thus increase the frequency ofplanets with Earth-like compositions compared with simulations with staticgiant planet orbits; and 2) drastically increase the efficiency of the deliveryof hydrous phases (water and serpentine) to terrestrial planets and thusproduce water worlds and/or wet Earths. Our results demonstrate that although awide variety of terrestrial planet compositions can still be produced, planetswith Earth-like compositions should be common within extrasolar planetarysystems.

The Compositional Diversity of Extrasolar Terrestrial Planets: II. Migration Simulations