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

36 Scopus citations


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 (US)
Pages (from-to)1234-1247
Number of pages14
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 1 2008


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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