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The intrinsic variability due to the magnetic activity of young active starsis one of the main challenges in detecting and characterising exoplanets. Wepresent a method able to model the stellar photosphere and its surfaceinhomogeneities (starspots) in young/active and fast-rotating stars, based onthe cross-correlation function (CCF) technique, to extract information aboutthe spot configuration of the star. Within the Global Architecture of PlanetarySystems (GAPS) Project at the Telescopio Nazionale Galileo, we analysed morethan 300 spectra of the young planet-hosting star V1298 Tau provided by HARPS-Nhigh-resolution spectrograph. By applying the SpotCCF model to the CCFs weextracted the spot configuration (latitude, longitude and projected fillingfactor) of this star, and also provided the new RVs time series of this target.We find that the features identified in the CCF profiles of V1298 Tau aremodulated by the stellar rotation, supporting our assumption that they arecaused by starspots. The analysis suggests a differential rotation velocity ofthe star with lower rotation at higher latitudes. Also, we find that SpotCCFprovides an improvement in RVs extraction with a significantly lower dispersionwith respect to the commonly used pipelines, with consequent mitigation of thestellar activity contribution modulated with stellar rotation. A detectionsensitivity test, by the direct injection of a planetary signal into the data,confirmed that the SpotCCF model improves the sensitivity and ability torecover planetary signals. Our method enables the modelling of the stellarphotosphere, extracting the spot configuration of young/active and rapidlyrotating stars. It also allows for the extraction of optimised RV time series,thereby enhancing our detection capabilities for new exoplanets and advancingour understanding of stellar activity.

The GAPS programme at TNG LII. Spot modeling of V1298 Tau using SpotCCF tool