Low Mg/Si planetary host stars and their Mg-depleted terrestrial planets

Details Low Mg/Si planetary host stars and their Mg-depleted terrestrial planets Low Mg/Si planetary host stars and their Mg-depleted terrestrial planets

2012-01-09

arxiv.org/abs/1201.1939v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

16 pages, 2 figures, 2 tables. Submitted to ApJ Letters

Scientific paper

Simulations have shown that a diverse range of extrasolar terrestrial planet bulk compositions are likely to exist, based on the observed variations in host star elemental abundances. Based on recent studies, it is expected that a significant proportion of host stars may have Mg/Si ratios below 1. Here we examine this previously neglected group of systems. Planets simulated as forming within these systems are found to be Mg-depleted (compared to the Earth), consisting of silicate species such as pyroxene and various feldspars. Planetary carbon abundances also vary in accordance with the host stars C/O ratio. The predicted abundances are in keeping with observations of polluted white dwarfs, lending validity to this approach. Further studies are required to determine the full planetary impacts of the bulk compositions predicted here.

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