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

Spina, L.; Palla, F.; Randich, S.; Sacco, G.; Jeffries, R.; Magrini, L.; Franciosini, E.; Meyer, M. R.; Tautvaisiene, G. and Gilmore, G., et al. (2015) In Astronomy & Astrophysics 582.
Abstract
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... (More)
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. (Less)
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keywords
stars: abundances, stars: chemically peculiar, stars: pre-main sequence, galaxies: star clusters: individual: Gamma Velorum, planet-star, interactions, techniques: spectroscopic
in
Astronomy & Astrophysics
volume
582
publisher
EDP Sciences
external identifiers
  • wos:000363538500133
  • scopus:84943748089
ISSN
0004-6361
DOI
10.1051/0004-6361/201526896
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English
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yes
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c4e83b1e-29e3-46c1-a270-59dbba28a585 (old id 8383423)
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2015-12-18 14:24:50
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@article{c4e83b1e-29e3-46c1-a270-59dbba28a585,
  abstract     = {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.},
  articleno    = {L6},
  author       = {Spina, L. and Palla, F. and Randich, S. and Sacco, G. and Jeffries, R. and Magrini, L. and Franciosini, E. and Meyer, M. R. and Tautvaisiene, G. and Gilmore, G. and Alfaro, E. J. and Prieto, C. Allende and Bensby, Thomas and Bragaglia, A. and Flaccomio, E. and Koposov, S. E. and Lanzafame, A. C. and Costado, M. T. and Hourihane, A. and Lardo, C. and Lewis, J. and Monaco, L. and Morbidelli, L. and Sousa, S. G. and Worley, C. C. and Zaggia, S.},
  issn         = {0004-6361},
  keyword      = {stars: abundances,stars: chemically peculiar,stars: pre-main sequence,galaxies: star clusters: individual: Gamma Velorum,planet-star,interactions,techniques: spectroscopic},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The Gaia-ESO Survey: chemical signatures of rocky accretion in a young solar-type star},
  url          = {http://dx.doi.org/10.1051/0004-6361/201526896},
  volume       = {582},
  year         = {2015},
}