The detailed chemical composition of the terrestrial planet host Kepler-10

Autor(es)

Liu, F. ^[1] ; Yong, D. ^[1] ; Asplund, M. ^[1] ; Ramirez, I. ^{[2, 3]} ; Melendez, J. ^[4] ; Gustafsson, B. ^{[5, 6]} ; Howes, L. M. ^{[1, 7]} ; Roederer, I. U. ^[8] ; Lambert, D. L. ^{[2, 3]} ; Bensby, T. ^[7]

Afiliação do(s) autor(es)

^[1] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611 - Australia

^[2] Univ Texas Austin, McDonald Observ, 2515 Speedway, Austin, TX 78712 - USA

^[3] Univ Texas Austin, Dept Astron, 2515 Speedway, Austin, TX 78712 - USA

^[4] Univ Sao Paulo, Dept Astron IAG USP, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil

^[5] Uppsala Univ, Inst Phys & Astron, Box 515, SE-75120 Uppsala - Sweden

^[6] NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm - Sweden

^[7] Lund Univ, Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund - Sweden

^[8] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 - USA

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 456, n. 3, p. 2636-2646, MAR 1 2016.
• Citações Web of Science: 9

Resumo

Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which could be due to the formation of terrestrial planets. In order to further examine this scenario, we conducted a line-by-line differential chemical abundance analysis of the terrestrial planet host Kepler-10 and 14 of its stellar twins. Stellar parameters and elemental abundances of Kepler-10 and its stellar twins were obtained with very high precision using a strictly differential analysis of high quality Canada-France-Hawaii Telescope, Hobby-Eberly Telescope and Magellan spectra. When compared to the majority of thick disc twins, Kepler-10 shows a depletion in the refractory elements relative to the volatile elements, which could be due to the formation of terrestrial planets in the Kepler-10 system. The average abundance pattern corresponds to similar to 13 Earth masses, while the two known planets in Kepler-10 system have a combined similar to 20 Earth masses. For two of the eight thick disc twins, however, no depletion patterns are found. Although our results demonstrate that several factors {[}e.g. planet signature, stellar age, stellar birth location and Galactic chemical evolution (GCE)] could lead to or affect abundance trends with condensation temperature, we find that the trends give further support for the planetary signature hypothesis. (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
• Modalidade de apoio: Auxílio à Pesquisa - Temático