Planetary Hosts And Accretion Signatures: A Search For 6Li

Details Planetary Hosts And Accretion Signatures: A Search For 6Li Planetary Hosts And Accretion Signatures: A Search For 6Li

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542302s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #423.02; Bulletin of the American Astronomical Society, Vol. 42, p.326

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It is now well established that atmospheres of solar-type stars with planetary companions are more metal-rich than those of the general disk field star population. The role of this metal enhancement in the formation and evolution of planetary systems remains unresolved and there are two competing interpretations: planets form preferentially in metal-rich environments, in which case the metal enhancement extends throughout the entire star, or the stars have accreted H-depleted planetary material, in which case the metal enhancement is limited to the outer convective envelope. It has been suggested that the presence of 6Li, a fragile isotope that is completely destroyed during the pre-MS evolution of solar-type stars, in the atmospheres of planetary host stars would be a unique signature of accretion. We present preliminary results from our analysis of 6Li/7Li ratios in high-resolution HET/HRS and Gemini-S/bHROS spectra of 10 planetary hosts. The results presented here are complemented by a companion paper presented at this meeting, in which we describe our analysis of the relative abundances of our sample versus element condensation temperature, another potential signature of accretion.

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