OGLE-2018-BLG-0971, MOA-2023-BLG-065, and OGLE-2023-BLG-0136: Microlensing events with prominent orbital effects
Astronomy & Astrophysics(2024)
摘要
We undertake a project to reexamine microlensing data gathered from
high-cadence surveys. The aim of the project is to reinvestigate lensing events
with light curves exhibiting intricate anomaly features associated with
caustics, yet lacking prior proposed models to explain these features. Through
detailed reanalyses considering higher-order effects, we identify that
accounting for orbital motions of lenses is vital in accurately explaining the
anomaly features observed in the light curves of the lensing events
OGLE-2018-BLG-0971, MOA-2023-BLG-065, and OGLE-2023-BLG-0136. We estimate the
masses and distances to the lenses by conducting Bayesian analyses using the
lensing parameters of the newly found lensing solutions. From these analyses,
we identify that the lenses of the events OGLE-2018-BLG-0971 and
MOA-2023-BLG-065 are binaries composed of M dwarfs, while the lens of
OGLE-2023-BLG-0136 is likely to be a binary composed of an early K-dwarf
primary and a late M-dwarf companion. For all lensing events, the probability
of the lens residing in the bulge is considerably higher than that of it being
located in the disk.
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