Beyond the Iron Peak: r- and s-Process Elemental Abundances in Stars with Planets
Article
Article Title | Beyond the Iron Peak: r- and s-Process Elemental Abundances in Stars with Planets |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Bond, J. C. (Author), Lauretta, D. S. (Author), Tinney, C. G. (Author), Butler, R. P. (Author), Marcy, G. W. (Author), Jones, H. R. A. (Author), Carter, B. D. (Author), O'Toole, S. J. (Author) and Bailey, J. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 682 (2), pp. 1234-1247 |
Number of Pages | 14 |
Year | 2008 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1086/589236 |
Web Address (URL) | https://iopscience.iop.org/article/10.1086/589236 |
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. |
Keywords | planetary systems; stars; abundances; chemically peculiar |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
340399. Macromolecular and materials chemistry not elsewhere classified | |
370104. Atmospheric composition, chemistry and processes | |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | University of Arizona, United States |
University of New South Wales | |
Carnegie Institution of Washington, United States | |
University of California, United States | |
University of Hertfordshire, United Kingdom | |
Centre for Astronomy, Solar Radiation and Climate | |
Macquarie University |
https://research.usq.edu.au/item/9yy3w/beyond-the-iron-peak-r-and-s-process-elemental-abundances-in-stars-with-planets
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