2018A&A...614A..84S -
Astronomy and Astrophysics, volume 614A, 84-84 (2018/6-1)
C/O vs. Mg/Si ratios in solar type stars: The HARPS sample.
SUAREZ-ANDRES L., ISRAELIAN G., GONZALEZ HERNANDEZ J.I., ADIBEKYAN V.Z., DELGADO MENA E., SANTOS N.C. and SOUSA S.G.
Abstract (from CDS):
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.
Abstract Copyright:
© ESO 2018
Journal keyword(s):
stars: abundances - stars: atmospheres - planetary systems
VizieR on-line data:
<Available at CDS (J/A+A/614/A84): table1.dat>
Simbad objects:
500
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