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KMT-2019-BLG-1715 : planetary microlensing event with three lens masses and two source stars
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(2021) KMT-2019-BLG-1715 : planetary microlensing event with three lens masses and two source stars. The Astronomical Journal, 161 (6). 270. doi:10.3847/1538-3881/abf4d0 ISSN 1538-3881.
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Official URL: https://doi.org/10.3847/1538-3881/abf4d0
Abstract
We investigate the gravitational microlensing event KMT-2019-BLG-1715, the light curve of which shows two short-term anomalies from a caustic-crossing binary-lensing light curve: one with a large deviation and the other with a small deviation. We identify five pairs of solutions, in which the anomalies are explained by adding an extra lens or source component in addition to the base binary-lens model. We resolve the degeneracies by applying a method in which the measured flux ratio between the first and second source stars is compared with the flux ratio deduced from the ratio of the source radii. Applying this method leaves a single pair of viable solutions, in both of which the major anomaly is generated by a planetary-mass third body of the lens, and the minor anomaly is generated by a faint second source. A Bayesian analysis indicates that the lens comprises three masses: a planet-mass object with ∼2.6 M J and binary stars of K and M dwarfs lying in the galactic disk. We point out the possibility that the lens is the blend, and this can be verified by conducting high-resolution follow-up imaging for the resolution of the lens from the source.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | The Astronomical Journal | ||||||||
Publisher: | American Astronomical Society | ||||||||
ISSN: | 1538-3881 | ||||||||
Official Date: | 2021 | ||||||||
Dates: |
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Volume: | 161 | ||||||||
Number: | 6 | ||||||||
Article Number: | 270 | ||||||||
DOI: | 10.3847/1538-3881/abf4d0 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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