2002MNRAS.335.1005R

Using very high-resolution (R ∼ 125000) and high-quality (signal-to-noise ratio ≥ 350) spectra, we have searched for ⁶ Li in stars hosting extrasolar planets. From detailed profile-fitting of the Lii resonance line at 6707.7 Å, we find no significant amount of ⁶ Li relative to ⁷ Li for any of eight planet-bearing stars ( ⁶ Li/ ⁷ Li ≤ 0.0-0.03) with strong Lii lines. In particular, we do not confirm the presence of ⁶ Li with ⁶ Li/ ⁷ Li = 0.13 reported by (Israelian et al.) for HD 82943, a star with two known planets. Several of the eight stars plus HD 219542 A, the planetless primary of a binary, have been identified in the literature as possible recipients of accreted terrestrial material. For all of the planet-hosting stars and an additional five planetless stars, we find no ⁶ Li.