نبذة مختصرة : International audience ; We report the discovery and characterisation of a giant transiting planet orbiting a nearby M3.5V dwarf (d = 80.4 pc, G = 15.1 mag, K=11.2 mag, R ⋆ = 0.358 ± 0.015 R ⊙ , M ⋆ = 0.340 ± 0.009 M ⊙ ). Using the photometric time series from TESS sectors 10, 36, 46, and 63 and near-infrared spectrophotometry from ExTrA, we measured a planetary radius of 0.77 ± 0.03 R J and an orbital period of 1.52 days. With high-resolution spectroscopy taken by the CFHT/SPIRou and ESO/ESPRESSO spectrographs, we refined the host star parameters ([Fe/H] = 0.27 ± 0.12) and measured the mass of the planet (0.273 ± 0.006 M J ). Based on these measurements, TOI-4860 b joins the small set of massive planets (> 80 M E ) found around mid to late M dwarfs (< 0.4 R ⊙ ), providing both an interesting challenge to planet formation theory and a favourable target for further atmospheric studies with transmission spectroscopy. We identified an additional signal in the radial velocity data that we attribute to an eccentric planet candidate (e = 0.66 ± 0.09) with an orbital period of 427 ± 7 days and a minimum mass of 1.66 ± 0.26 M J , but additional data would be needed to confirm this.
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