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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Revisiting the 16 Cygni planet host at unprecedented precision and exploring automated tools for precise abundances

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Author(s):
Tucci Maia, M. [1, 2] ; Melendez, J. [3] ; Lorenzo-Oliveira, D. [3] ; Spina, L. [3] ; Jofre, P. [2]
Total Authors: 5
Affiliation:
[1] Lab Nacl Astrofis, Rua Estados Unidos 154, BR-37504364 Itajuba, MG - Brazil
[2] Univ Diego Portales, Fac Ingn, Nucleo Astron, Ave Ejercito 441, Santiago - Chile
[3] Univ Sao Paulo, Dept Astron IAG USP, Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Astronomy & Astrophysics; v. 628, AUG 20 2019.
Web of Science Citations: 0
Abstract

The binary system 16 Cygni is key in studies of the planet-star chemical composition connection, as only one of the stars is known to host a planet. This allows us to better assess the possible influence of planet interactions on the chemical composition of stars that are born from the same cloud and thus should have a similar abundance pattern. In our previous work, we found clear abundance differences for elements with Z <= 30 between both components of this system and a trend of these abundances as a function of the condensation temperature (T-c), which suggests a spectral chemical signature related to planet formation. In this work we show that our previous findings are still consistent even if we include more species, such as the volatile N and neutron capture elements (Z > 30). We report a slope with T-c of 1.56 +/- 0.24 x 10(-5) dex K-1, that is good agreement with our previous work. We also performed some tests using ARES and iSpec to measure automatically the equivalent width and found T-c slopes in reasonable agreement with our results as well. In addition, we determined abundances for Li and Be by spectral synthesis, finding that 16 Cyg A is richer not only in Li but also in Be, when compared to its companion. This may be evidence of planet engulfment, indicating that the T-c trend found in this binary system may be a chemical signature of planet accretion in the A component, rather than an imprint of the giant planet rocky core formation on 16 Cyg B. (AU)

FAPESP's process: 16/20667-8 - Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars
Grantee:Diego Lorenzo de Oliveira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/15706-9 - Differential abundances in solar-type stars: implications for planets formation and stellar nucleosynthesis
Grantee:Lorenzo Spina
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/04055-8 - High precision spectroscopy: from the first stars to planets
Grantee:Jorge Luis Melendez Moreno
Support type: Research Projects - Thematic Grants