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Context. Different theories have been developed to explain the origins andproperties of close-in giant planets, but none of them alone can explain all ofthe properties of the warm Jupiters (WJs, Porb = 10 - 200 days). One of themost intriguing characteristics of WJs is that they have a wide range oforbital eccentricities, challenging our understanding of their formation andevolution. Aims. The investigation of these systems is crucial in order to putconstraints on formation and evolution theories. TESS is providing asignificant sample of transiting WJs around stars bright enough to allowspectroscopic follow-up studies. Methods. We carried out a radial velocity (RV)follow-up study of the TESS candidate TOI-4515 b with the high-resolutionspectrograph HARPS-N in the context of the GAPS project, the aim of which is tocharacterize young giant planets, and the TRES and FEROS spectrographs. We thenperformed a joint analysis of the HARPS-N, TRES, FEROS, and TESS data in orderto fully characterize this planetary system. Results. We find that TOI-4515 borbits a 1.2 Gyr-old G-star, has an orbital period of Pb = 15.266446 +-0.000013 days, a mass of Mb = 2.01 +- 0.05 MJ, and a radius of Rb = 1.09 +-0.04 RJ. We also find an eccentricity of e = 0.46 +- 0.01, placing this planetamong the WJs with highly eccentric orbits. As no additional companion has beendetected, this high eccentricity might be the consequence of past violentscattering events.

The GAPS Programme at TNG L -- TOI-4515 b: An eccentric warm Jupiter orbiting a 1.2 Gyr-old G-star