摘要：We report a planet in a binary that was discovered from the analysis of the microlensing event OGLE-2018-BLG-1700.We identify the triple nature of the lens from the fact that the anomaly pattern can be decomposed into two parts produced by two binary-lens events, in which one binary pair has a mass ratio of ~0.01 between the lens components and the other pair has a mass ratio of ~0.3.We find two sets of degenerate solutions, in which one solution has a projected separation between the primary and its stellar companion less than the angular Einstein radius ${\theta }_{{\rm{E}}}$ (close solution), while the other solution has a separation greater than ${\theta }_{{\rm{E}}}$ (wide solution).From the Bayesian analysis with the constraints of the event timescale and angular Einstein radius, we find that the planet has a mass of ${4.4}_{-2.0}^{+3.0}\,{M}_{{\rm{J}}}$ and the stellar binary components have masses of ${0.42}_{-0.19}^{+0.29}\,{M}_{\odot }$ and ${0.12}_{-0.05}^{+0.08}\,{M}_{\odot }$, respectively, and the distance to the lens is ${D}_{{\rm{L}}}={7.6}_{-0.9}^{+1.2}\,\mathrm{kpc}$.The planet is a circumstellar planet according to the wide solution, while it is a circumbinary planet according to the close solution.
