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

Bond, J. C. and Lauretta, D. S. and Tinney, C. G. and Butler, R. P. and Marcy, G. W. and Jones, H. R. A. and Carter, B. D. and O'Toole, S. J. and Bailey, J. (2008) Beyond the iron peak: r- and s-process elemental abundances in stars with planets. The Astrophysical Journal, 682 (2). pp. 1234-1247. ISSN 0004-637X

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version not held.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 23 Dec 2008 03:25
Last Modified: 02 Jul 2013 23:11
Uncontrolled Keywords: planetary systems; stars; abundances; chemically peculiar
Fields of Research (FOR2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: doi: 10.1086/589236
URI: http://eprints.usq.edu.au/id/eprint/4790

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