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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.)

Thorium in solar twins: implications for habitability in rocky planets

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Autor(es):
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Botelho, R. B. [1] ; Milone, A. de C. [1] ; Melendez, J. [2] ; Bedell, M. [3] ; Spina, L. [4] ; Asplund, M. [5] ; dos Santos, L. [6] ; Bean, J. L. [7] ; Ramirez, I. [8] ; Yong, D. [5] ; Dreizler, S. [9] ; Alves-Brito, A. [10] ; Yana Galarza, J. [2]
Número total de Autores: 13
Afiliação do(s) autor(es):
[1] Inst Nacl Pesquisas Espaciais, Div Astrofis, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos - Brazil
[2] Univ Sao Paulo, Dept Astron, IAG, Rua Matao 1226, BR-05509900 Sao Paulo - Brazil
[3] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 - USA
[4] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800 - Australia
[5] Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611 - Australia
[6] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix - Switzerland
[7] Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 - USA
[8] Tacoma Community Coll, 6501 South 19th St, Tacoma, WA 98466 - USA
[9] Georg August Univ Gottingen, Inst Astrophys, Wilhelmspl 1, D-37073 Gottingen - Germany
[10] Univ Fed Rio Grande do Sul, Inst Fis, Ave Bento Goncalves 9500, Porto Alegre, RS - Brazil
Número total de Afiliações: 10
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 482, n. 2, p. 1690-1700, JAN 2019.
Citações Web of Science: 1
Resumo

We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets that can be formed over the evolution of the Galaxy's thin disc, We have estimated Th abundances with an average precision of 0.025 dex (in both {[}Th/H] and {[}Th/Fe]) through comprehensive spectral synthesis of a Thu\_line present at 4019.1290 angstrom, using very high resolution (R = 115000) high quality HARPS spectra obtained at the ESO La Silla Observatory. We have confirmed that there is a large energy budget from Th decay for maintaining mantle convection inside potential rocky planets around solar twins, from the Galactic thin disc formation until now, because the pristine {[}Th/H](ZAMS) is super-solar on average under a uniform dispersion of 0.056 dex (varying from +0.037 up to +0.138 dex based on linear fits against isochrone stellar age), Comparing to neodymium (Nd) and europium (Eu), two others neutron-capture elements, the stellar pristine abundance of Th follows Eu along the Galactic thin disc evolution, but it does not follow Nd, probably because neodymium has a significant contribution from the s-process (about 60 per cent). (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