Skip to main content

Research Repository

Advanced Search

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

Jeffries

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


Authors



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.

Acceptance Date Sep 3, 2015
Publication Date Oct 8, 2015
Publicly Available Date Mar 29, 2024
Journal Astronomy and Astrophysics
Print ISSN 0365-0138
Publisher EDP Sciences
DOI https://doi.org/10.1051/0004-6361/201526896
Keywords stars: abundances / stars: chemically peculiar / stars: pre-main sequence, galaxies: star clusters: individual: Gamma Velorum, planet-star interactions, techniques: spectroscopic
Publisher URL https://doi.org/10.1051/0004-6361/201526896

Files




You might also like



Downloadable Citations