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We present the discovery of TOI-2136b, a sub-Neptune planet transiting every7.85 days a nearby M4.5V-type star, identified through photometric measurementsfrom the TESS mission. The host star is located $33$ pc away with a radius of$R_{\ast} = 0.34\pm0.02\ R_{\odot}$, a mass of $0.34\pm0.02\ M_{\odot}$ and aneffective temperature of $\rm 3342\pm100\ K$. We estimate its stellar rotationperiod to be $75\pm5$ days based on archival long-term photometry. We confirmand characterize the planet based on a series of ground-based multi-wavelengthphotometry, high-angular-resolution imaging observations, and precise radialvelocities from CFHT/SPIRou. Our joint analysis reveals that the planet has aradius of $2.19\pm0.17\ R_{\oplus}$, and a mass measurement of $6.4\pm2.4\M_{\oplus}$. The mass and radius of TOI2136b is consistent with a broad rangeof compositions, from water-ice to gas-dominated worlds. TOI-2136b falls closeto the radius valley for low-mass stars predicted by the thermally drivenatmospheric mass loss models, making it an interesting target for futurestudies of its interior structure and atmospheric properties.

TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136