A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b

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 (R_p = 2.82_−0.63^+0.65 R_⊕) and TOI-2081b to be a super-Earth-sized planet (R_p = 2.04_−0.54^+0.50 R_⊕). Furthermore, we obtained that TOI-4479b, with a short orbital period of 1.15890_−0.00001^+0.00002 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.