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

J. C. Bond, D. S. Lauretta, C. G. Tinney, R. P. Butler, G. W. Marcy, H. R A Jones, B. D. Carter, S. J. O'Toole, J. Bailey

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1234-1247
    Number of pages14
    JournalAstrophysical Journal
    Volume682
    Issue number2
    DOIs
    Publication statusPublished - 1 Aug 2008

    Keywords

    • Planetary systems
    • Stars: abundances
    • Stars: chemically peculiar

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