Fossils in the Photosphere: Condensation Temperature Trends in the Chemical Abundances of Stars with Radial-Velocity Companions

Details Fossils in the Photosphere: Condensation Temperature Trends in the Chemical Abundances of Stars with Radial-Velocity Companions Fossils in the Photosphere: Condensation Temperature Trends in the Chemical Abundances of Stars with Radial-Velocity Companions

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.0607l&link_type=abstract

American Astronomical Society Meeting 203, #06.07; Bulletin of the American Astronomical Society, Vol. 35, p.1213

Biology

Scientific paper

We present [X/Fe] values, derived from high-resolution spectroscopic analyses, for 18 elements observed in 65 stars with giant planet and/or brown dwarf companions. The wide range of condensation temperatures of the elements studied permits a reliable estimation of the correlation between condensation temperature and chemical abundance for each star. We employ these results, along with recently improved estimates of the masses of the stars themselves, to thoroughly investigate the possibility that the photospheres of these stars have been systematically polluted by material depleted in volatile elements. Additionally, we perform similar but more precise differential analyses on two star systems in which only one member is observed to possess a planetary companion - 16 Cygni A & B, and HD219542 A & B. We compare the differential abundance patterns between the primary and secondary in each case, and investigate the hypothesis that the observed chemical variations in these specific instances might be attributed to differential accretion of circumstellar material. We gratefully acknowledge the support of this work by the University of Washington Astrobiology Program and a grant from the National Astrobiology Institute.

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