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

Adibekyan, V.; Santos, N. C.; Figueira, P.; Dorn, Caroline; Sousa, S. G.; Delgado-Mena, E.; Israelian, G.; Hakobyan, A. A.; Mordasini, Christoph (2015). From stellar to planetary composition: Galactic chemical evolution of Mg/Si mineralogical ratio. Astronomy and astrophysics, 581(L2), L2. EDP Sciences 10.1051/0004-6361/201527059

	Text aa27059-15.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (447kB) | Request a copy
Preview	Text 1508.04970v1.pdf - Accepted Version Available under License Publisher holds Copyright. Download (249kB) | Preview

Aims. The main goal of this work is to study element ratios that are important for the formation of planets of different masses. Methods. We study potential correlations between the existence of planetary companions and the relative elemental abundances of their host stars. We use a large sample of FGK-type dwarf stars for which precise Mg, Si, and Fe abundances have been derived using HARPS high-resolution and high-quality data. Results. A first analysis of the data suggests that low-mass planet host stars show higher [Mg/Si] ratios, while giant planet hosts present [Mg/Si] that is lower than field stars. However, we found that the [Mg/Si] ratio significantly depends on metallicity through Galactic chemical evolution. After removing the Galactic evolution trend only the difference in the [Mg/Si] elemental ratio between low-mass planet hosts and non-hosts was present in a significant way. These results suggest that low-mass planets are more prevalent around stars with high [Mg/Si]. Conclusions. Our results demonstrate the importance of Galactic chemical evolution and indicate that it may play an important role in the planetary internal structure and composition. The results also show that abundance ratios may be a very relevant issue for our understanding of planet formation and evolution.

Interest & Impact

Downloads

190 since deposited on 20 Jun 2016
14 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item