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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Tucci Maia, M. [1, 2] ; Melendez, J. [3] ; Lorenzo-Oliveira, D. [3] ; Spina, L. [3] ; Jofre, P. [2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 628, AUG 20 2019.
Citações Web of Science: 0
Resumo

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)

Processo FAPESP: 16/20667-8 - Cronômetros estelares: a conexão entre idade, atividade cromosférica, rotação e abundâncias de lítio em estrelas de tipo solar
Beneficiário:Diego Lorenzo de Oliveira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 14/15706-9 - Abundâncias diferenciais em estrelas de tipo solar: implicações sobre a formação de planetas e nucleossíntese estelar
Beneficiário:Lorenzo Spina
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas
Beneficiário:Jorge Luis Melendez Moreno
Linha de fomento: Auxílio à Pesquisa - Temático