A close binary lens revealed by the microlensing event Gaia20bof
arxiv(2024)
摘要
During the last 25 years, hundreds of binary stars and planets have been
discovered towards the Galactic Bulge by microlensing surveys. Thanks to a new
generation of large-sky surveys, it is now possible to regularly detect
microlensing events across the entire sky. The OMEGA Key Projet at the Las
Cumbres Observatory carries out automated follow-up observations of
microlensing events alerted by these surveys with the aim of identifying and
characterizing exoplanets as well as stellar remnants. In this study, we
present the analysis of the binary lens event Gaia20bof. By automatically
requesting additional observations, the OMEGA Key Project obtained dense time
coverage of an anomaly near the peak of the event, allowing characterization of
the lensing system. The observed anomaly in the lightcurve is due to a binary
lens. However, several models can explain the observations. Spectroscopic
observations indicate that the source is located at ≤2.0 kpc, in agreement
with the parallax measurements from Gaia. While the models are currently
degenerate, future observations, especially the Gaia astrometric time series as
well as high-resolution imaging, will provide extra constraints to distinguish
between them.
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