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Higher depletion of lithium in planet host stars: no age and mass effect

S. G. Sousa, J. M. Fernandes, G. Israelian, N. C. Santos

Abstract
Recent observational work by Israelian et al. has shown that sun-like planet host stars in the temperature range 5700 K < Teff < 5850 K have lithium abundances that are significantly lower than those observed for "single" field stars. In this letter we use stellar evolutionary models to show that differences in stellar mass and age are not responsible for the observed correlation. This result, along with the finding of Israelian et al., strongly suggest that the observed lithium difference is likely linked to some process related to the formation and evolution of planetary systems.

Keywords
stars: evolution – stars: fundamental parameters – stars: abundances – stars: chemically peculiar – stars: planetary systems

Astronomy and Astrophysics
Volume 512, Number of pages L5_1
2010 March

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia