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Three Binary-source Binary-lens Microlensing Events from the 2024 Microlensing Campaign
Publications of the Astronomical Society of the PacificAbstract We investigated microlensing events detected by the Optical Gravitational Lensing Experiment (OGLE) and Korea Microlensing Telescope Network surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features.
Michael D Albrow +2 more
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DETERMINING THE PHYSICAL LENS PARAMETERS OF THE BINARY GRAVITATIONAL MICROLENSING EVENT MOA-2009-BLG-016 [PDF]
Astrophysical Journal, 2010 We report the result of the analysis of the light curve of the microlensing event MOA-2009-BLG-016. The light curve is characterized by a short-duration anomaly near the peak and an overall asymmetry. We find that the peak anomaly is due to a binary companion to the primary lens and the asymmetry of the light curve is explained by the parallax effect ...
D P Bennett, Akihiko Fukui, Y Itow
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OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected through the Channel of a Gravitational Binary-lens Event [PDF]
Astrophysical Journal, 2017 Abstract Due to the nature of the gravitational field, microlensing, in principle, provides an important tool for detecting faint and even dark brown dwarfs. However, the number of identified brown dwarfs is limited due to the difficulty of the lens mass measurement that is needed to check the substellar nature of the lensing object.
Cheongho Han +2 more
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Complete Parallax and Proper‐Motion Solutions for Halo Binary‐Lens Microlensing Events [PDF]
Astrophysical Journal, 1999 A major problem in the interpretation of microlensing events is that the only measured quantity, the Einstein time scale t_E, is a degenerate combination of the three quantities one would like to know, the mass, distance, and speed of the lens. This degeneracy can be partly broken by measuring either a "parallax" or a "proper motion" and completely ...
Gould, Andrew, Andronov, Nikolay
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Rapid analysis of binary lens gravitational microlensing light curves [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 A new algorithm for the autonomous fitting of light curves of gravitational microlensing by binary lenses is presented here. The algorithm relies on the combination of artificial neural networks with a conventional amoeba (downhill simplex) method to achieve a success rate of 68 per cent using strict success criteria, in an average fitting time of 48 s
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Ambiguities in fits of observed binary lens galactic microlensing events
Astronomy & Astrophysics, 1999For observed galactic microlensing events only one fit is usually presented, though, especially for a binary lens, several fits may be possible. This has been shown for the MACHO LMC#1 event (Dominik & Hirshfeld 1996). Here I discuss the strong binary lens events OGLE#7 and DUO#2.
openaire +1 more source
Fitting binary lens gravitational microlensing events with example-based algorithms
2014Fitting binary lens models to gravitational microlensing event is currently a time consuming and labour-intensive process. Example-based algorithms more commonly used in the field of data mining were applied to simulatded and observed light curves in order to facilitate the fitting of a simple-seven-parameter binary lens model with minimal human ...
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Improved Aberth–Ehrlich root-finding algorithm and its further application for binary microlensing
Monthly Notices of the Royal Astronomical Society, 2022Hossein Fatheddin, Sedighe Sajadian
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