The Diversity of Extrasolar Terrestrial Planets

Details The Diversity of Extrasolar Terrestrial Planets The Diversity of Extrasolar Terrestrial Planets

2010-01-22

arxiv.org/abs/1001.3901v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 1 figure. Submitted to the proceedings of IAU symposium 265 Chemical Abundances in the Universe: Connecting First Sta

Scientific paper

10.1017/S1743921310001079

Extrasolar planetary host stars are enriched in key planet-building elements. These enrichments have the potential to drastically alter the building blocks available for terrestrial planet formation. Here we report on the combination of dynamical models of late-stage terrestrial planet formation within known extrasolar planetary systems with chemical equilibrium models of the composition of solid material within the disk. This allows us to constrain the bulk elemental composition of extrasolar terrestrial planets. A wide variety of resulting planetary compositions exist, ranging from those that are essentially "Earth-like", containing metallic Fe and Mg-silicates, to those that are dominated by graphite and SiC. This implies that a diverse range of terrestrial planets are likely to exist within extrasolar planetary systems.

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