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J/A+A/614/A84    C/O vs Mg/Si ratios in solar type stars (Suarez-Andres+, 2018)

C/O vs Mg/Si ratios in solar type stars: the HARPS sample. Suarez-Andres L., Israelian G., Gonzalez Hernandez J.I., Adibekyan V.Zh., Delgado Mena E., Santos N.C., Sousa S.G. <Astron. Astrophys. 614, A84 (2018)> =2018A&A...614A..84S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Abundances Keywords: stars: abundances - stars: atmospheres - stars: planetary systems Abstract: 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. 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 (<30M) and high-mass planets (>30M) to test for a possible relation with the mass. 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. Description: Stellar parameters, C/O and Mg/Si (with errors) for a sample of 499 solar-type stars File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 65 499 Stellar parameters, C/O and Mg/Si (with errors)
See also: J/AJ/105/2299 : Li abundance of solar-type stars. II. (Soderblom+, 1993) J/A+A/327/587 : Abundances of 9 solar-type stars (Tomkin+ 1997) J/AZh/81/541 : Abundances of 15 solar analogues (Galeev+, 2004) J/ApJ/636/1098 : Debris disks around solar-type stars (Bryden+, 2006) J/A+A/468/663 : Li abundances in solar-analog stars (Takeda+, 2007) J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009) J/A+A/515/A93 : Li abundances in solar-analog stars. II. (Takeda+, 2010) J/ApJ/720/1592 : Abundances of solar analogs with planets (Hernandez+, 2010) J/A+A/601/A67 : Kepler solar-type stars modeling (Creevey+, 2017) J/ApJ/839/94 : Abundances of solar twins from Keck/HIRES (Bedell+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Star Name of the star 13- 16 I4 K Teff Effective Temperature 20- 23 F4.2 [cm/s2] logg log surface gravity 27- 31 F5.2 [-] [Fe/H] Metallicity 36- 39 F4.2 [-] C/O Carbon-to-oxygen abundance ratio 44- 47 F4.2 [-] e_C/O Error on C/O 53- 56 F4.2 [-] Mg/Si Magnesium-to-silicon abundance ratio 62- 65 F4.2 [-] e_Mg/Si Error on Mg/Si
Acknowledgements: Lucia Suarez-Andres, lsuarez(at)ing.iac.es
(End) Lucia Suarez-Andres [IAC, Spain], Patricia Vannier [CDS] 22-Feb-2018
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