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We present two new planetary systems found around cool dwarf stars with datafrom the K2 mission. The first system was found in K2-239 (EPIC 248545986),char- acterized in this work as M3.0V and observed in the 14th campaign of K2.It consists of three Earth-size transiting planets with radii of 1.1, 1.0 and1.1 R Earth, showing a compact configuration with orbital periods of 5.24, 7.78and 10.1 days, close to 2:3:4 resonance. The second was found in K2-240 (EPIC249801827), characterized in this work as M0.5V and observed in the 15thcampaign. It consists of two transiting super-Earths with radii 2.0 and 1.8 REarth and orbital periods of 6.03 and 20.5 days. The equilibrium temperaturesof the atmospheres of these planets are estimated to be in the range of 380-600K and the amplitudes of signals in transmission spectroscopy are estimated at~10 ppm.

Two planetary systems with transiting Earth-size and super-Earth planets orbiting late-type dwarf stars