Two Jupiter-mass Planets Discovered by the KMTNet Survey in 2017

We report two microlensing events, KMT-2017-BLG-1038 and KMT-2017-BLG-1146, that are caused by planetary systems. These events were discovered by Korea Microlensing Telescope Network survey observations from the 2017 bulge season. The discovered systems consist of a planet and host star with mass ratios of {5.3}_-0.4^+0.2× {10}^-3 and {2.0}_-0.1^+0.6× {10}^-3, respectively. Based on a Bayesian analysis assuming a Galactic model without stellar remnant hosts, we find that the planet KMT-2017-BLG-1038Lb is a super-Jupiter-mass planet ({M}_{{p}} ={2.04}_-1.15^+2.02 {M}_{{J}}) orbiting a mid-M dwarf host ({M}_{{h}}={0.37}_-0.20^+0.36 {M}_⊙ ) that is located at {6.01}_-1.72^+1.27 kpc toward the Galactic bulge. The other planet, KMT-2017-BLG-1146Lb, is a sub-Jupiter-mass planet ({M}_{{p}}={0.71}_-0.42^+0.80 {M}_{{J}}) orbiting a mid-M dwarf host ({M}_{{h}}={0.33}_-0.20^+0.36 {M}_⊙ ) at a distance of {6.50}_-2.00^+1.38 kpc toward the Galactic bulge. Both are potentially gaseous planets that are beyond their hosts’ snow lines. These typical microlensing planets will be routinely discovered by second-generation microlensing surveys, rapidly increasing the number of detections.