| Texto completo | |
| Autor(es): |
Tucci Maia, M.
;
Melendez, J.
;
Lorenzo-Oliveira, D.
;
Spina, L.
;
Jofre, P.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ASTRONOMY & ASTROPHYSICS; v. 628, p. 11-pg., 2019-08-20. |
| 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: | 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas |
| Beneficiário: | Jorge Luis Melendez Moreno |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| 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 |
| Modalidade de apoio: | 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 |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |