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We present a super-Earth orbiting close to the inner edge of the habitablezone of the cool dwarf star K2-286 (EPIC 249889081), detected with data fromthe K2 mission in its $15^{th}$ campaign. The planet has radius of $2.1\pm0.2$R$_{\oplus}$, near the 1.5 - 2.0 R$_{\oplus}$ gap in the radii distribution.The equilibrium temperature is $347^{+21}_{-11}$ K, cooler than most of thesmall planets with well measured masses, and the orbital period is$27.359\pm0.005$ days. K2-286, located at a distance of $76.3\pm0.3$ pc, is anM0V star with estimated effective temperature of $3926\pm100$ K, less activethan other M dwarf stars hosting exoplanets. The expected radial velocitysemi-amplitude induced by the planet on the star is $1.9^{+1.3}_{-1.2}$m$\cdot$s$^{-1}$, and the amplitude of signals in transit transmissionspectroscopy is estimated at $5.0\pm3.0$ ppm. Follow-up observations for massmeasurements and transit spectroscopy should be desirable for this relativelybright target ($m_V=12.76, m_{Ks}=9.32$) hosting a transiting super-Earthwithin the inner edge of the habitable zone.

A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star