Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of A Long-term Asymmetric Perturbation
arXiv:1611.00775 · doi:10.3847/1538-3881/aa5d07
Abstract
In the process of analyzing an observed light curve, one often confronts various scenarios that can mimic the planetary signals causing difficulties in the accurate interpretation of the lens system. In this paper, we present the analysis of the microlensing event OGLE-2016-BLG-0733. The light curve of the event shows a long-term asymmetric perturbation that would appear to be due to a planet. From the detailed modeling of the lensing light curve, however, we find that the perturbation originates from the binarity of the source rather than the lens. This result demonstrates that binary sources with roughly equal-luminosity components can mimic long-term perturbations induced by planets with projected separations near the Einstein ring. The result also represents the importance of the consideration of various interpretations in planet-like perturbations and of high-cadence observations for ensuring the unambiguous detection of the planet.
7 pages, 1 tables, 7 figures, Accepted to AJ
References in corpus (6)
- MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
- Predictions for Microlensing Planetary Events from Core Accretion Theory
- Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
- OGLE-2013-BLG-0102LA,B: Microlensing binary with components at star/brown-dwarf and brown-dwarf/planet boundaries
- Empirical Study of Simulated Two-planet Microlensing Event
- OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized by Simultaneous Ground-based and Space-based Observation