A Search for ${}^6$Li in Lithium-Poor Stars with Planets

Abstract

Using high-resolution, high quality spectra we investigate the presence of ${}^6$Li in two lithium-poor stars that host extrasolar planetary systems. We present improved atomic and molecular line lists for the region in the vicinity of the lithium line at 6707.8 Å, and we produce an excellent fit to the solar spectrum. From line profile fitting, we find results consistent with no ${}^6$Li in either of the lithium-poor planet-bearing stars or in three comparison stars with and without planets, and 1-$\sigma$ upper limits of 0.04 for the isotopic ratios of the two lithium-poor stars give an upper limit of 0.3 Jupiter masses of material with primordial abundances that could have been recently deposited in their outer layers. Our results suggest that post-main sequence accretion of planets or planetary material that is undepleted in lithium is uncommon.

arXiv comment31 pages, 10 figures, AJ in press

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• The Curious Case of Elemental Abundance Differences in the Dual Hot Jupiter Hosts WASP-94AB
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• Measurements of the Isotopic Ratio 6Li/7Li in Stars with Planets
• Exploring the production and depletion of lithium in the Milky Way stellar disk
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• The Super Lithium-Rich Red Giant Rapid Rotator G0928+73.2600: A Case for Planet Accretion?
• Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields
• Stellar Nucleosynthesis in the Hyades Open Cluster
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• Chemical Composition of the Planet-Harboring Star TrES-1
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• Lithium in the Upper Centaurus Lupus and Lower Centaurus Crux Subgroups of Scorpius-Centaurus
• New Lithium Measurements in Metal-Poor Stars
• On the lithium abundance of the visual binary components $\xi$ Boo A (G8V) and $\xi$ Boo B (K5V)
• Light elements in stars with exoplanets