Two sub-Neptunes around the M dwarf TOI-1470

Aims. A transiting planet candidate with a sub-Neptune radius orbiting the nearby ($d$ = 51.9$\pm$0.07 pc) M1.5 V star TOI-1470 period of $\sim$2.5 d was announced by NASA Transiting Exoplanet Survey Satellite (TESS), which observed field in four different sectors. We aim to validate its planetary nature using precise radial velocities (RVs) taken CARMENES spectrograph. Methods. obtained 44 RV measurements spanning eight months between 3 June 2020 and 17 January 2021. For better characterization parent activity, we also collected contemporaneous optical photometric observations at Joan Or\'o Sierra Nevada Observatories, retrieved archival photometry from literature. used ground-based MuSCAT MuSCAT2 MuSCAT3 confirm transit signals. performed combined spectroscopic analysis including Gaussian processes Keplerian orbits simultaneously account for stellar activity Results. estimate that has rotation 29$\pm$3 based on data. The confirms discovery planet, b, an orbital 2.527093$\pm$0.000003 d, mass $7.32^{+1.21}_{-1.24}$ M$_{\oplus}$, $2.18^{+0.04}_{-0.04}$ R$_{\oplus}$. discover second not previously TESS, c, 18.08816$\pm$0.00006 $7.24^{+2.87}_{-2.77}$ $2.47^{+0.02}_{-0.02}$ two planets are placed same side valley M dwarfs lie inner border habitable zone.