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Chemical clues on the formation of planetary systems

Published online by Cambridge University Press:  10 November 2011

Elisa Delgado Mena ,
Garik Israelian ,
Jonay I. González Hernández ,
Jade C. Bond ,
Nuno C. Santos ,
Stéphane Udry  and
Michel Mayor
Elisa Delgado Mena
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain. email: edm@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain.
Garik Israelian
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain. email: edm@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain.
Jonay I. González Hernández
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain. email: edm@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain.
Jade C. Bond
Affiliation:
Planetary Science Institute, 1700 E. Fort Lowell, Tucson, AZ 85719, USA.
Nuno C. Santos
Affiliation:
Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal. Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal.
Stéphane Udry
Affiliation:
Observatoire de Genève, 51 ch. des Maillettes, CH-1290 Sauverny, Switzerland.
Michel Mayor
Affiliation:
Observatoire de Genève, 51 ch. des Maillettes, CH-1290 Sauverny, Switzerland.
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Abstract

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Theoretical studies suggest that C/O and Mg/Si are the most important elemental ratios in determining the mineralogy of terrestrial planets. The C/O ratio controls the distribution of Si among carbide and oxide species, while Mg/Si gives information about the silicate mineralogy. We find mineralogical ratios quite different from those of the Sun, showing that there is a wide variety of planetary systems which are not similar to Solar System. Many of planetary host stars present a Mg/Si value lower than 1, so their planets will have a high Si content to form species such as MgSiO3. This type of composition can have important implications for planetary processes like plate tectonics, atmospheric composition or volcanism. Moreover, the information given by these ratios can guide us in the search of stars more probable to form terrestrial planets.

Keywords

stars: abundancesstars: atmospheresstars: fundamental parametersplanetary systemsplanetary systems: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 25 - 29
Copyright
Copyright © International Astronomical Union 2011

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