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The relative distribution of abundances of refractory, intermediate, andvolatile elements in stars with planets can be an important tool forinvestigating the internal migration of a giant planet. This migration can leadto the accretion of planetesimals and the selective enrichment of the star withthese elements. We report on a spectroscopic determination of the atmosphericparameters and chemical abundances of the parent stars in transiting planetsCoRoT-2b and CoRoT-4b. Adding data for CoRoT-3 and CoRoT-5 from the literature,we find a flat distribution of the relative abundances as a function of theircondensation temperatures. For CoRoT-2, the relatively high lithium abundanceand intensity of its Li I resonance line permit us to propose an age of 120Myr, making this stars one of the youngest stars with planets to date. Weintroduce a new methodology to investigate a relation between the abundances ofthese stars and the internal migration of their planets. By simulating theinternal migration of a planet in a disk formed only by planetesimals, we areable to separate the stellar fractions of refractory (R), intermediate (I), andvolatile (V) rich planetesimals accreting onto the central star. Intermediateand volatile element fractions enriching the star are similar and much largerthan those of pure refractory ones. We also show that these results are highlydependent on the model adopted for the disk distribution regions in terms of R,I, and V elements and other parameters considered. We note however, that thisself-enrichment mechanism is only efficient during the first 20-30 Myr or laterin the lifetime of the disk when the surface convection layers of the centralstar for the first time attain its minimum size configuration.

Distribution of refractory and volatile elements in CoRoT exoplanet host stars