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

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Astrophysics Aims and scope

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.

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Authors and Affiliations

  1. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, Portugal

    V. Adibekyan, S. G. Sousa, N. C. Santos & E. Delgado Mena

  2. Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Porto, Portugal

    H. M. Gonçalves da Silva & N. C. Santos

  3. Byurakan Astrophysical Observatory, Byurakan, Armenia

    A. A. Hakobyan

Authors
  1. V. Adibekyan
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  2. H. M. Gonçalves da Silva
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  3. S. G. Sousa
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  4. N. C. Santos
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  5. E. Delgado Mena
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  6. A. A. Hakobyan
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Corresponding author

Correspondence to V. Adibekyan.

Additional information

Published in Astrofizika, Vol. 60, No. 3, pp. 351-363 (September 2017).

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Adibekyan, V., Gonçalves da Silva, H.M., Sousa, S.G. et al. Mg/Si Mineralogical Ratio of Low-Mass Planet Hosts. Correction for the NLTE Effects. Astrophysics 60, 325–332 (2017). https://doi.org/10.1007/s10511-017-9486-5

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  • DOI: https://doi.org/10.1007/s10511-017-9486-5

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