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We explore a sample of 148 solar-like stars to search for a possiblecorrelation between the slopes of the abundance trends versus condensationtemperature (known as the Tc slope) with stellar parameters and Galacticorbital parameters in order to understand the nature of the peculiar chemicalsignatures of these stars and the possible connection with planet formation. Wefind that the Tc slope significantly correlates (at more than 4sigma) with thestellar age and the stellar surface gravity. We also find tentative evidencethat the Tc slope correlates with the mean galactocentric distance of the stars(Rmean), suggesting that those stars that originated in the inner Galaxy havefewer refractory elements relative to the volatiles. While the average Tc slopefor planet-hosting solar analogs is steeper than that of their counterpartswithout planets, this difference probably reflects the difference in their ageand Rmean. We conclude that the age and probably the Galactic birth place aredeterminant to establish the star's chemical properties. Old stars (and starswith inner disk origin) have a lower refractory-to-volatile ratio.

On the origin of stars with and without planets. Tc trends and clues to Galactic evolution