We report the discovery of a giant planet in event UKIRT-2017-BLG-001 , detected by the UKIRT microlensing survey .
The mass ratio between the planet and its host is q = 1.50 _ { -0.14 } ^ { +0.17 } \times 10 ^ { -3 } , about 1.5 times the Jupiter/Sun mass ratio .
The event lies 0.35 ^ { \circ } from the Galactic center and suffers from high extinction of A _ { K } = 1.68 .
Therefore , it could be detected only by a near-infrared survey .
The field also suffers from large spatial differential extinction , which makes it difficult to estimate the source properties required to derive the angular Einstein radius .
Nevertheless , we find evidence suggesting that the source is located in the far disk .
If correct , this would be the first source star of a microlensing event to be identified as belonging to the far disk .
We estimate the lens mass and distance using a Bayesian analysis to find that the planet ’ s mass is 1.28 ^ { +0.37 } _ { -0.44 } M _ { J } , and it orbits a 0.81 ^ { +0.21 } _ { -0.27 } M _ { \odot } star at an instantaneous projected separation of 4.18 ^ { +0.96 } _ { -0.88 } AU .
The system is at a distance of 6.3 ^ { +1.6 } _ { -2.1 } kpc , and so likely resides in the Galactic bulge .
In addition , we find a non-standard extinction curve in this field , in agreement with previous results toward high-extinction fields near the Galactic center .