http://arxiv.org/abs/1802.06795
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 $q=1.50_{-0.14}^{+0.17}\times10^{-3}$, 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 show that the source is most likely 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 $1.47^{+0.59}{-0.56}\,M{J}$, and it orbits a $0.93^{+0.36}{-0.34}\,M{\odot}$ star at an instantaneous projected separation of $4.5^{+1.1}{-1.0}$ AU. The system is at a distance of $6.6^{+1.6}{-2.1}$ 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 towards high-extinction fields near the Galactic center.
Y. Shvartzvald, S. Novati, B. Gaudi, et. al.
Wed, 21 Feb 18
31/58
Comments: 25 pages, 7 figures, 2 tables. Submitted to the AAS journals