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Mg/Si Mineralogical Ratio of Low-Mass Planet Hosts. Correction for the NLTE Effects

V. Zh. Adibekyan, H. M. R. da Silva, S. G. Sousa, N. C. Santos, E. Delgado Mena, A. A. Hakobyan

Abstract
Mg/Si and Fe/Si ratios are important parameters that control the composition of rocky planets. In this work we applied non-LTE correction to the Mg and Si abundances of stars with and without planets to confirm/reject our previous findings that [Mg/Si] atmospheric abundance is systematically higher for Super-Earth/Neptune-mass planet hosts than stars without planets. Our results show that the small differences of stellar parameters observed in these two groups of stars are not responsible for the already reported difference in the [Mg/Si] ratio. Thus, the high [Mg/Si] ratio of Neptunian hosts is probably related to the formation efficiency of these planets in such environments.

Keywords
planetary systems: abundances: metallicity: Galaxy

Astrophysics
Volume 60, Number 3, Page 325
2017 September

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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