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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 499 Stellar parameters, C/O and Mg/Si (with errors)
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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
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Lucia Suarez-Andres, lsuarez(at)ing.iac.es
(End) Lucia Suarez-Andres [IAC, Spain], Patricia Vannier [CDS] 22-Feb-2018