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

Spina, L and Palla, F and Randich, S and Sacco, G and Jeffries, R and Magrini, L and Franciosini, E and Meyer, MR and Tautvaisiene, G and Gilmore, G and Alfaro, EJ and Prieto, CA and Bensby, T and Bragaglia, A and Flaccomio, E and Koposov, SE and Lanzafame, AC and Costado, MT and Hourihane, A and Lardo, C and Lewis, J and Monaco, L and Morbidelli, L and Sousa, SG and Worley, CC and Zaggia, S (2015) The Gaia-ESO Survey: chemical signatures of rocky accretion in a young solar-type star. Astronomy and Astrophysics, 582. ISSN 0004-6361

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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
Date Deposited: 22 Nov 2016 12:29
Last Modified: 06 Sep 2017 19:54
DOI or Identification number: 10.1051/0004-6361/201526896
URI: http://researchonline.ljmu.ac.uk/id/eprint/4840

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