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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.)

Detailed chemical compositions of the wide binary HD 80606/80607: revised stellar properties and constraints on planet formation

Texto completo
Liu, F. [1] ; Yong, D. [2] ; Asplund, M. [2] ; Feltzing, S. [1] ; Mustill, A. J. [1] ; Melendez, J. [3] ; Ramirez, I. [4] ; Lin, J. [2]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund - Sweden
[2] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611 - Australia
[3] Univ Sao Paulo, IAG, Dept Astron, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil
[4] Tacoma Community Coll, 6501 S 19th St, Tacoma, WA 98466 - USA
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 614, JUL 3 2018.
Citações Web of Science: 6

Differences in the elemental abundances of planet-hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution spectra with high signal-to-noise ratio obtained with Keck/HIRES. HD 80606 is known to host a giant planet with the mass of four Jupiters, but no planet has been detected around HD 80607 so far. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are that (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607, with an average difference of +0.013 +/- 0.002 dex (sigma = 0.009 dex); and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming that this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We cannot exclude the possibility that HD 80606 might have accreted about 2.5 to 5 M-Earth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant. (AU)

Processo FAPESP: 12/24392-2 - Espectroscopia de alta precisão: impacto no estudo de planetas, estrelas, a galáxia e cosmologia
Beneficiário:Jorge Luis Melendez Moreno
Linha de fomento: Auxílio à Pesquisa - Temático