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We observed the microlensing event MOA-2007-BLG-192 at high angularresolution in JHKs with the NACO adaptive optics system on the VLT while theobject was still amplified by a factor 1.23 and then at baseline 18 monthslater. We analyzed and calibrated the NACO photometry in the standard 2MASSsystem in order to accurately constrain the source and the lens star fluxes. Wedetect light from the host star of MOA-2007-BLG-192Lb, which significantlyreduces the uncertainties in its char- acteristics as compared to earlieranalyses. We find that MOA-2007-BLG-192L is most likely a very low mass latetype M-dwarf (0.084 [+0.015] [-0.012] M\odot) at a distance of 660 [+100] [-70]pc orbited by a 3.2 [+5.2] [-1.8] M\oplus super-Earth at 0.66 [+0.51] [-0.22]AU. We then discuss the properties of this cold planetary system.

A frozen super-Earth orbiting a star at the bottom of the Main Sequence