Bibcode
Suárez-Andrés, L.; Israelian, G.; González Hernández, J. I.; Adibekyan, V. Zh.; Delgado Mena, E.; Santos, N. C.; Sousa, S. G.
Bibliographical reference
Highlights on Spanish Astrophysics IX, Proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain, ISBN 978-84-606-8760-3. S. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernández-Monteagudo, A. Sánchez-Lavega, S. Pérez-Hoyos (eds.), 2017 , p. 567-572
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3
2017
Citations
1
Refereed citations
0
Description
The determination of the chemical composition of extrasolar planets has
been the subject of numerous studies in the last years. While the
composition of the atmosphere of planets can be observed through, e.g.,
the absorption of the star light, the composition of the solids remains
difficult to estimate. As both planetesimals and planets are formed in
the same environment, their composition is expected to be the same as
their host star. Elemental ratios are important as they govern the
distribution and formation of chemical species in the protoplanetary
disc: the C/O ratio controls the amount of carbides and silicates that
can be formed while Mg/Si gives information about the silicate
mineralogy. Silicates are an important ingredient in the formation of
rocky planets, as they are the most abundant component of the mantle and
crust of these planets. We present a uniform study of C/O and Mg/Si
element abundance ratios for 101 stars with detected planets and 430
stars without detected planets obtained using high resolution spectra
from the HARPS sample. We will discuss the implications of these ratios
on the nature of planets that could have been formed in those planetary
systems.