A search for 6Li in stars with planets

Using very high-resolution (R ∼ 125 000) 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 Li I resonance line at 6707.7 A, we find no significant amount of 6 Li relative to 7 Li for any of eight planet-bearing stars ( 6 Lι/ 7 Li ≤ 0.0-4.03) with strong Li I lines. In particular, we do not confirm the presence of 6 Li with 6 Lι/ 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.