The Institute of Astrophysics of Andalusia (IAA-CSIC) participates in the study of the giant planets of the V1298 Tau system, which in just twenty million years have already reached their final size. The finding has been possible thanks to radial velocity measurements from the HARPS-N spectrographs, at the Roque de los Muchachos Observatory (ORM), and from CARMENES, at the Calar Alto Observatory (CAHA)