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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.)

The Gaia-ESO Survey: chemical signatures of rocky accretion in a young solar-type star

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Autor(es):
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Spina, L. [1, 2] ; Palla, F. [1] ; Randich, S. [1] ; Sacco, G. [1] ; Jeffries, R. [3] ; Magrini, L. [1] ; Franciosini, E. [1] ; Meyer, M. R. [4] ; Tautvaisiene, G. [5] ; Gilmore, G. [6] ; Alfaro, E. J. [7] ; Prieto, C. Allende [8, 9] ; Bensby, T. [10] ; Bragaglia, A. [11] ; Flaccomio, E. [12] ; Koposov, S. E. [13, 6] ; Lanzafame, A. C. [14] ; Costado, M. T. [7] ; Hourihane, A. [6] ; Lardo, C. [15] ; Lewis, J. [6] ; Monaco, L. [16] ; Morbidelli, L. [1] ; Sousa, S. G. [17] ; Worley, C. C. [6] ; Zaggia, S. [18]
Número total de Autores: 26
Afiliação do(s) autor(es):
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[1] Osserv Astrofis Arcetri, INAF, I-50125 Florence - Italy
[2] Univ Sao Paulo, Dept Astron IAG, BR-05509900 Sao Paulo, SP - Brazil
[3] Keele Univ, Res Inst Environm Phys Sci & Appl Math, Astrophys Grp, Keele ST5 5BG, Staffs - England
[4] Swiss Fed Inst Technol, Inst Astron, CH-8093 Zurich - Switzerland
[5] Vilnius State Univ, Inst Theoret Phys & Astron, LT-01108 Vilnius - Lithuania
[6] Univ Cambridge, Inst Astron, Cambridge CB3 0HA - England
[7] CSIC, Inst Astrofis Andalucia, E-18080 Granada - Spain
[8] Inst Astrofis Canarias, Tenerife 38205 - Spain
[9] Univ La Laguna, E-38206 Tenerife - Spain
[10] Lund Observ, Dept Astron & Theoret Phys, S-22100 Lund - Sweden
[11] Osservatorio Astron Bologna, INAF, I-40127 Bologna - Italy
[12] Osserv Astron Palermo, INAF, I-90134 Palermo - Italy
[13] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992 - Russia
[14] Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, I-95123 Catania - Italy
[15] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside - England
[16] Univ Andres Bello, Dept Ciencias Fis, Santiago - Chile
[17] Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, P-4150762 Oporto - Portugal
[18] Padova Observ, INAF, I-35122 Padua - Italy
Número total de Afiliações: 18
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 582, OCT 2015.
Citações Web of Science: 10
Resumo

It is well known that newly formed planetary systems undergo processes of orbital reconfiguration and planetary migration. As a result, planets or protoplanetary objects may accrete onto the central star, being fused and mixed into its external layers. If the accreted mass is sufficiently high and the star has a sufficiently thin convective envelope, such events may result in a modification of the chemical composition of the stellar photosphere in an observable way, enhancing it with elements that were abundant in the accreted mass. The recent Gaia-ESO Survey observations of the 10-20 Myr old Gamma Velorum cluster have enabled identifying a star that is significantly enriched in iron with respect to other cluster members. In this Letter we further investigate the abundance pattern of this star, showing that its abundance anomaly is not limited to iron, but is also present in the refractory elements, whose overabundances are correlated with the condensation temperature. This finding strongly supports the hypothesis of a recent accretion of rocky material. (AU)

Processo FAPESP: 14/15706-9 - Abundâncias diferenciais em estrelas de tipo solar: implicações sobre a formação de planetas e nucleossíntese estelar
Beneficiário:Lorenzo Spina
Linha de fomento: Bolsas no Brasil - Pós-Doutorado