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We analysed the effects of planet ingestion on the characteristics of apre-MS star similar to the Gamma Velorum cluster member 2MASSJ08095427--4721419 (#52). We discussed the effects of changing the age $t_0$ atwhich the accretion episode occurs, the mass of the ingested planet and itschemical composition. We showed that the mass of the ingested planet requiredto explain the current [Fe/H]^#52 increases by decreasing the age $t_0$ and/orby decreasing the Iron content of the accreted matter.  We compared the predictions of a simplified accretion method -- where onlythe variation of the surface chemical composition is considered -- with that ofa full accretion model that properly accounts for the modification of thestellar structure. We showed that the two approaches result in differentconvective envelope extension which can vary up to 10 percent. We discussed theimpact of the planet ingestion on a stellar model in the colour-magnitudediagram, showing that a maximum shift of about 0.06 dex in the colour and 0.07dex in magnitude are expected and that such variations persist even much laterthe accretion episode. We also analysed the systematic bias in the stellar massand age inferred by using a grid of standard non accreting models to recoverthe characteristics of an accreting star. We found that standard non accretingmodels can safely be adopted for mass estimate, as the bias is <= 6 percent,while much more caution should be used for age estimate where the differencescan reach about 60 percent.

Effect of planet ingestion on low-mass stars evolution: the case of 2MASS J08095427--4721419 star in the Gamma Velorum cluster