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The main goal of this work is to study element ratios that are important forthe formation of planets of different masses. We study potential correlationsbetween the existence of planetary companions and the relative elementalabundances of their host stars. We use a large sample of FGK-type dwarf starsfor which precise Mg, Si, and Fe abundances have been derived using HARPShigh-resolution and high-quality data. A first analysis of the data suggeststhat low-mass planet host stars show higher [Mg/Si] ratios, while giant planethosts present [Mg/Si] that is lower than field stars. However, we found thatthe [Mg/Si] ratio significantly depends on metallicity through Galacticchemical evolution. After removing the Galactic evolution trend only thedifference in the [Mg/Si] elemental ratio between low-mass planet hosts andnon-hosts was present in a significant way. These results suggests thatlow-mass planets are more prevalent around stars with high [Mg/Si]. Our resultsdemonstrate the importance of Galactic chemical evolution and indicate that itmay play an important role in the planetary internal structure and composition.

From stellar to planetary composition: Galactic chemical evolution of Mg/Si mineralogical ratio