Bibcode
Suárez-Andrés, L.; Israelian, G.; González Hernández, J. I.; Adibekyan, V. Zh.; Delgado Mena, E.; Santos, N. C.; Sousa, S. G.
Bibliographical reference
Astronomy and Astrophysics, Volume 614, id.A84, 8 pp.
Advertised on:
6
2018
Journal
Citations
44
Refereed citations
43
Description
Context. Aims: We aim to present a detailed study of the
magnesium-to-silicon and carbon-to-oxygen ratios (Mg/Si and C/O) and
their importance in determining the mineralogy of planetary companions.
Methods: Using 499 solar-like stars from the HARPS sample, we
determined C/O and Mg/Si elemental abundance ratios to study the nature
of the possible planets formed. We separated the planetary population in
low-mass planets (<30 M⊙) and high-mass planets
(>30 M⊙) to test for a possible relation with the
mass. Results: We find a diversity of mineralogical ratios that
reveal the different kinds of planetary systems that can be formed, most
of them dissimilar to our solar system. The different values of the
Mg/Si and C/O can determine different composition of planets formed. We
found that 100% of our planetary sample present C/O < 0.8. 86% of
stars with high-mass companions present 0.8 > C/O > 0.4, while 14%
present C/O values lower than 0.4. Regarding Mg/Si, all stars with
low-mass planetary companion showed values between one and two, while
85% of the high-mass companion sample does. The other 15% showed Mg/Si
values below one. No stars with planets were found with Mg/Si > 2.
Planet hosts with low-mass companions present C/O and Mg/Si similar to
those found in the Sun, whereas stars with high-mass companions have
lower C/O.
The full Table 1 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/614/A84
Related projects
Observational Tests of the Processes of Nucleosynthesis in the Universe
Several spectroscopic analyses of stars with planets have recently been carried out. One of the most remarkable results is that planet-harbouring stars are on average more metal-rich than solar-type disc stars. Two main explanations have been suggested to link this metallicity excess with the presence of planets. The first of these, the “self
Garik
Israelian