PLATOSpec's first results: Three new transiting warm Jupiters from the WINE survey TIC 147027702, TIC 245076932 and TIC 87422071

We report the discovery and characterisation of three transiting warm Jupiters: TIC 147027702b, TIC 245076932b and TIC 87422071b. These systems were initially identified as transiting candidates using light curves generated from the full-frame images of the TESS mission. We confirmed the planetary nature of these objects with ground-based spectroscopic follow-up observations using FEROS and the new PLATOSpec spectrograph attached to the ESO 1.52 m telescope at the La Silla Observatory, and with ground-based photometric observations of the Observatoire Moana, Las Cumbres Observatory Global Telescope and ASTEP. From a global fit to the photometry and radial velocities, we determine that the planet TIC 147027702b has a low-eccentric orbit ($e=0.13\pm 0.05$) with a period of 44.4 days and has a mass of $1.09_{-0.13}^{+0.07}$ M${}_J$ and a radius of $0.98\pm 0.06$ R${}_J$. TIC 245076932b has a moderately low mass of $0.51\pm 0.05$ M${}_J$, a radius of $0.97\pm 0.05$ R${}_J$, and an eccentric orbit ($e=0.43\pm 0.02$) with a period of 21.6 days. TIC 87422071b has a mass of $1.29\pm 0.10$ M${}_J$, a radius of $0.97\pm 0.08$ R${}_J$, and has a slightly eccentric orbit ($e=0.12\pm 0.07$) with a period of 11.3 days. These well-characterised warm Jupiters expand the currently limited sample of similar gas giants and provide valuable benchmarks for testing models of giant-planet formation, migration, and tidal evolution.