Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program - Galactic stellar populations and planets

By V. Adibekyan, Sérgio F. Sousa, Nuno C. Santos, E. D. Mena, J. Hernández, G. Israelian, M. Mayor, G. Khachatryan. 2012

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Context. We performed a uniform and detailed abundance analysis of 12 refractory elements (Na, Mg, Al, Si, Ca, Ti, Cr, Ni, Co, Sc, Mn, and V) for a sample of 1111 FGK dwarf stars from the HARPS GTO planet search program. Of these stars, 109 are known to harbor giant planetary companions and 26 stars are exclusively hosting Neptunians and super-Earths. Aims. The two main goals of this paper are to investigate whether there are any differences between the elemental abundance trends for stars of different stellar populations and to characterize the planet host and non-host samples in terms of their [X/H]. The extensive study of this sample, focused on the abundance differences between stars with and without planets will be presented in a parallel paper. Methods. The equivalent widths of spectral lines were automatically measured from HARPS spectra with the ARES code. The abundances of the chemical elements were determined using an LTE abundance analysis relative to the Sun, with the 2010 revised version of the spectral synthesis code MOOG and a grid of Kurucz ATLAS9 atmospheres. To separate the Galactic stellar populations we applied both a purely kinematical approach and a chemical method. Results. We found that the chemically separated (based on the Mg, Si, and Ti abundances) thin- and thick disks are also chemically disjunct for Al, Sc, Co, and Ca. Some bifurcation might also exist for Na, V, Ni, and Mn, but there is no clear boundary of their [X/Fe] ratios. We confirm that an overabundance in giant-planet host stars is clear for all studied elements.We also confirm that stars hosting only Neptunian-like planets may be easier to detect around stars with similar metallicities than around non-planet hosts, although for some elements (particulary α-elements) the lower limit of [X/H] is very abrupt.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/f4f55aa1088ce7cfa17a182781e3edca652b9325

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Citations in the corpus

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The Payne: Self-consistent ab initio Fitting of Stellar Spectra (2018, methodology): “…with either physical or data-driven models, have important limitations that are well documented in the recent literature (Boeche et al. 2011; Adibekyan et al. 2012; Bensby et al. 2014; BlancoCuaresma et al. 2014; Nissen et al. 2014; Holtzman et al. 2015; Ness et al. 2015; Boeche & Grebel…”
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Target Selection for the SDSS-IV APOGEE-2 Survey (2017, background): “Previous studies of dwarf stars have indicated that planet-hosting stars have unique chemical abundance signatures (e.g., Adibekyan et al. 2012), some of which may be useful for constraining the planets’ composition (e.g., Delgado Mena et al. 2010); however, agreement between the reported…”
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THE STELLAR POPULATION STRUCTURE OF THE GALACTIC DISK (2015, background): “…become clear from unbiased observations of element abundances of disk stars that their distribution in ([Fe/H], [α/Fe]) is distinctly bimodal, composed of two sequences—high- and low[α/Fe]—that are disjoint at low-[Fe/H] and that merge near solar [Fe/H] (Adibekyan et al. 2012; Nidever et al. 2014).”