Low Mg/Si Planetary Host Stars and Their Mg-depleted Terrestrial Planets

Bibcode
2012ApJ...747L...2C
DOI
10.1088/2041-8205/747/1/L2
Carter-Bond, Jade C.; O'Brien, David P.; Delgado Mena, Elisa; Israelian, G.; Santos, Nuno C.; González-Hernández, J. I.
Bibliographical reference

The Astrophysical Journal Letters, Volume 747, Issue 1, article id. L2 (2012).

Advertised on:
3
2012
Number of authors
6
IAC number of authors
3
Citations
40
Refereed citations
32
Description
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 Earth), consisting of silicate species such as pyroxene and various feldspars. Planetary carbon abundances also vary in accordance with the host star 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.
Related projects
Project Image
Observational Tests of the Processes of Nucleosynthesis in the Universe

Several spectroscopic analyses of stars with planets have recently been carried out. One of the most remarkable results is that planet-harbouring stars are on average more metal-rich than solar-type disc stars. Two main explanations have been suggested to link this metallicity excess with the presence of planets. The first of these, the “self

Garik
Israelian
In progress
Type
Refereed
Stellar & Interstellar Physics (FEEI)

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