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

Tyck till om SwePub Sök här!

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.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
stars: abundances
stars: chemically peculiar
stars: pre-main sequence
galaxies: star clusters: individual: Gamma Velorum
planet-star
interactions
techniques: spectroscopic

Palla, F. (author)
Randich, S. (author)
Sacco, G. (author)
Jeffries, R. (author)
Magrini, L. (author)
Franciosini, E. (author)
Meyer, M. R. (author)
Tautvaisiene, G. (author)
Gilmore, G. (author)
Alfaro, E. J. (author)
Prieto, C. Allende (author)
Bensby, ThomasLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)astr-tbe (author)
Bragaglia, A. (author)
Flaccomio, E. (author)
Koposov, S. E. (author)
Lanzafame, A. C. (author)
Costado, M. T. (author)
Hourihane, A. (author)
Lardo, C. (author)
Lewis, J. (author)
Monaco, L. (author)
Morbidelli, L. (author)
Sousa, S. G. (author)
Worley, C. C. (author)
Zaggia, S. (author)
Astronomi - Genomgår omorganisationInstitutionen för astronomi och teoretisk fysik - Genomgår omorganisation (creator_code:org_t)

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.