We report the discovery of a planetary system in which a super-earth orbits a late M-dwarf host .
The planetary system was found from the analysis of the microlensing event OGLE-2017-BLG-0482 , wherein the planet signal appears as a short-term anomaly to the smooth lensing light curve produced by the host .
Despite its weak signal and short duration , the planetary signal was firmly detected from the dense and continuous coverage by three microlensing surveys .
We find a planet/host mass ratio of q \sim 1.4 \times 10 ^ { -4 } .
We measure the microlens parallax \pi _ { E } from the long-term deviation in the observed lensing light curve , but the angular Einstein radius \theta _ { E } can not be measured because the source trajectory did not cross the planet-induced caustic .
Using the measured event timescale and the microlens parallax , we find that the masses of the planet and the host are M _ { p } = 9.0 _ { -4.5 } ^ { +9.0 } M _ { \oplus } and M _ { host } = 0.20 _ { -0.10 } ^ { +0.20 } M _ { \odot } , respectively , and the projected separation between them is a _ { \perp } = 1.8 _ { -0.7 } ^ { +0.6 } au .
The estimated distance to the lens is D _ { L } = 5.8 _ { -2.1 } ^ { +1.8 } kpc .
The discovery of the planetary system demonstrates that microlensing provides an important method to detect low-mass planets orbiting low-mass stars .