| Summary: | Aims. We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods. We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light
curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contamination limits for both candidates
and validate them as planet-sized companions.
Results. We found TOI-4479b to be a sub-Neptune-sized planet (Rp = 2.82+0.65
−0.63 R⊕) and TOI-2081b to be a super-Earth-sized planet
(Rp = 2.04+0.50
−0.54 R⊕). Furthermore, we obtained that TOI-4479b, with a short orbital period of 1.15890+0.00002
−0.00001 days, lies within the
Neptune desert and is in fact the largest nearly ultra-short period planet around an M dwarf known to date.
Conclusions. These results make TOI-4479b rare among the currently known exoplanet population of M dwarf stars and an especially
interesting target for spectroscopic follow-up and future studies of planet formation and evolution
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