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

Abstract

Using very high-resolution (R$\sim$ 125,000) and high quality (S/N $\ge$ 350) spectra, we have searched for ${}^6$Li in stars hosting extra-solar planets. From detailed profile-fitting of the Li {\sc i} resonance line at 6707.7 Å, we find no significant amount of ${}^6$Li relative to the ${}^7$Li for any of 8 planet bearing stars (${}^6$Li/${}^7$Li $\le$ 0.0 - 0.03) with a strong Li {\sc i} lines. In particular, we do not confirm the presence of ${}^6$Li with ${}^6$Li/${}^7$Li = 0.13 reported by Israelian et al.(2001) for HD 82943, a star with two known planets. Several of the 8 stars plus HD 219542 A, the planet-less 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 5 planet-less stars, we find no ${}^6$Li.

Accepted for MNRAS, 18 pages (12 figures included)

References in corpus (3)

• On the Nature of Stars with Planets
• Planet accretion and the abundances of lithium isotopes
• Beryllium abundances in stars hosting giant planets

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