| Full text | |
| Author(s): |
Tucci Maia, M.
;
Melendez, J.
;
Lorenzo-Oliveira, D.
;
Spina, L.
;
Jofre, P.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | ASTRONOMY & ASTROPHYSICS; v. 628, p. 11-pg., 2019-08-20. |
| 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: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |
| 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/15706-9 - Differential abundances in solar-type stars: implications for planets formation and stellar nucleosynthesis |
| Grantee: | Lorenzo Spina |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |