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Beyond the iron peak : r- and s-process elemental abundances in stars with planets

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/81007

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Title: Beyond the iron peak : r- and s-process elemental abundances in stars with planets
Related: Astrophysical journal, Vol. 682, No. 2, p.1234-1247
DOI: 10.1086/589236
Publisher: University of Chicago Press
Date: 2008
FoR/RFCD Code(s): 020100 Astronomical and Space Sciences
Author/Creator: Bond, J. C
Author/Creator: Lauretta, D. S
Author/Creator: Tinney, C. G
Author/Creator: Butler, R. P
Author/Creator: Marcy, G. W
Author/Creator: Jones, H. R. A
Author/Creator: Carter, B. D
Author/Creator: O'Toole, S. J
Author/Creator: Bailey, J
Description: We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd, and Eu (along with previously published abundances for C and Si) are presented. This study is one of the first to specifically examine planetary host stars for the heavy elements produced by neutron capture reactions. We find that the abundances in host stars are chemically different from both the standard solar abundances and the abundances in non-host stars in all elements studied, with enrichments over non-host stars ranging from 0.06 dex (for O) to 0.11 dex (for Cr and Y). Such abundance trends are in agreement with other previous studies of field stars and lead us to conclude that the chemical anomalies observed in planetary host stars are the result of normal galactic chemical evolution processes. Based on this observation, we conclude that the observed chemical traits of planetary host stars are primordial in origin, coming from the original nebula and not from a "pollution" process occurring during or after formation, and that planet formation occurs naturally with the evolution of stellar material.
Description: 14 page(s)
Subject Keyword: 020100 Astronomical and Space Sciences
Subject Keyword: planetary systems
Subject Keyword: stars : abundances
Subject Keyword: stars : chemically peculiar
Resource Type: journal article
Organisation: Macquarie University. Dept. of Physics

Identifier: http://hdl.handle.net/1959.14/81007
Identifier: ISSN:1538-4357
Identifier: mq-rm-2008990135
Language: eng
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