Detailed abundances of the wide pairs of stars with and without planets: the binary systems 16 Cyg and HD 219542

Abstract

We present results of the comparative analysis of the two wide binary systems -- 16 Cyg, with a giant gas planet orbiting around 16 Cyg B, and HD 219542 without planet detected. Atmospheric parameters of the binary components and the Sun were determined using their high-resolution spectra and the SME tools for automatic spectral analysis. By applying the synthetic spectrum method, we derived abundances of 29 and 23 chemical elements in 16 Cyg and HD 219542, respectively. For 19 of these elements, our results are based on the non-local thermodynamic equilibrium (NLTE) line formation. For both 16 Cyg and HD 219542, we obtained a small abundance difference between the A and B components: +0.019$\pm$0.012 and -0.014$\pm$0.019, respectively, suggesting only a weak influence of the giant gas planet formation on chemical composition of the host star atmosphere. For HD 219542 A and B, trends of the relative-to-solar abundances with the dust condensation temperature are similar to the literature data for the solar analogues without detected planets. The components of 16 Cyg reveal very similar behaviour of [X/H] with the condensation temperature, however, it is different from that for HD 219542. This indicates a specific chemical composition of the cloud from which the 16 Cyg binary system formed.

11 pages, 4 figures, 6 tables. Accepted in MNRAS

References in corpus (21)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The Dartmouth Stellar Evolution Database
• The chemical make-up of the Sun: A 2020 vision
• Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems
• Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
• Solar oxygen abundance
• High precision abundances in the 16 Cyg binary system: a signature of the rocky core in the giant planet
• A high precision chemical abundance analysis of the HAT-P-1 stellar binary: constraints on planet formation
• High-precision abundances of elements in Kepler LEGACY stars. Verification of trends with stellar age
• Hyperfine Splitting in the VALD Database of Spectral-line Parameters
• Abundance Differences Between Exoplanet Binary Host Stars XO-2N and XO-2S -- Dependence on Stellar Parameters
• NLTE study of scandium in the Sun
• Chemical evidence for planetary ingestion in a quarter of Sun-like stars
• Influence of inelastic collisions with hydrogen atoms on the non-LTE modelling of Ca I and Ca II lines in late-type stars
• 3D non-LTE line formation of neutral carbon in the Sun
• Model-independent measurement of internal stellar structure in 16 Cygni A and B
• Distant Relatives: The Chemical Homogeneity of Comoving Pairs Identified in Gaia
• Non-LTE line formation for Si I-II-III in A-B stars and the origin of Si II emission lines in iota Her
• Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants
• Detailed elemental abundances of binary stars: Searching for signatures of planet formation and atomic diffusion
• Fundamental stellar parameters of benchmark stars from CHARA interferometry -- II. Dwarf stars

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