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Title:
Chemical clues on the formation of planetary systems
Authors:
Delgado Mena, Elisa; Israelian, Garik; González Hernández, Jonay I.; Bond, Jade C.; Santos, Nuno C.; Udry, Stéphane; Mayor, Michel
Affiliation:
AA(Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain. ; Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain.), AB(Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain), AC(Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain.), AD(Planetary Science Institute, 1700 E. Fort Lowell, Tucson, AZ 85719, USA.), AE(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.), AF(Observatoire de Genève, 51 ch. des Maillettes, CH-1290 Sauverny, Switzerland.), AG(Observatoire de Genève, 51 ch. des Maillettes, CH-1290 Sauverny, Switzerland.)
Publication:
The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution, Proceedings of the International Astronomical Union, IAU Symposium, Volume 276, p. 25-29
Publication Date:
11/2011
Origin:
CUP
Keywords:
stars: abundances, stars: atmospheres, stars: fundamental parameters, planetary systems, planetary systems: formation
Abstract Copyright:
(c) 2011: Copyright © International Astronomical Union 2011
DOI:
10.1017/S1743921311019880
Bibliographic Code:
2011IAUS..276...25D

Abstract

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.

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