Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

We present the discovery and characterization of two sub-Neptunes in close orbits, as well a tentative outer planet similar size, orbiting TOI-1260 - low metallicity K6V dwarf star. Photometry from TESS yields radii $R_{\rm b} = 2.33 \pm 0.10$ $R_{\oplus}$ c} 2.82 0.15$ $R_{\oplus}$, periods 3.13 7.49 days for TOI-1260b TOI-1260c, respectively. combined data with series ground-based follow-up observations to characterize planetary system. From HARPS-N high-precision radial velocities we obtain $M_{\rm 8.61_{ 1.46 } ^ { + 1.36 }$ $M_{\oplus}$ 11.84_{ 3.23 3.38 $M_{\oplus}$. The star is moderately active complex activity pattern, which necessitated use Gaussian process regression both light curve detrending velocity modelling, latter case guided by suitable indicators. successfully disentangle stellar-induced signal signals, underlining importance usefulness Process approach. test system's stability against atmospheric photoevaporation find that planets are classic examples structure composition ambiguity typical $2-3$ range.