Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion
arXiv:1306.3744 · doi:10.1088/0004-637X/778/2/134
Abstract
Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel to determine physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events OGLE-2006-BLG-277 and OGLE-2012-BLG-0031 for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion.
arXiv comment6 pages and 4 figures
References in corpus (24)
- A method for optimal image subtraction
- The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
- Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
- Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
- Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
- OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
- Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
- MOA-2009-BLG-387Lb: A massive planet orbiting an M dwarf
- First microlens mass measurement: PLANET photometry of EROS BLG-2000-5
- Discovering Galactic Planets by Gravitational Microlensing: Magnification Patterns and Light Curves
- Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41
- Planetary Detection Efficiency of the Magnification 3000 Microlensing Event OGLE-2004-BLG-343
- Light and Motion in SDSS Stripe 82: The Catalogues
- The 1995 Pilot Campaign of PLANET: Searching for Microlensing Anomalies through Precise, Rapid, Round-the-Clock Monitoring
- Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
- Hexadecapole Approximation in Planetary Microlensing
- Gravitational lens under perturbations: Symmetry of perturbing potentials with invariant caustics
- Gravitational Microlensing Evidence for a Planet Orbiting a Binary Star System
- Einstein Radii from Binary Lensing Events
- Reanalysis of the Gravitational Microlensing Event MACHO-97-BLG-41 based on Combined Data
- A Giant Planet beyond the Snow Line in Microlensing Event OGLE-2011-BLG-0251
- OGLE-2005-BLG-018: Characterization of Full Physical and Orbital Parameters of a Gravitational Binary Lens
- Characterizing Lenses and Lensed Stars of High-Magnification Single-lens Gravitational Microlensing Events With Lenses Passing Over Source Stars
- Using Orbital Effects to Break the Close/wide Degeneracy in Binary-lens Microlensing Events
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- A Search for Stellar-Mass Black Holes via Astrometric Microlensing
- OGLE-2013-BLG-0102LA,B: Microlensing binary with components at star/brown-dwarf and brown-dwarf/planet boundaries
- Microlensing Searches for Exoplanets
- Spitzer as Microlens Parallax Satellite: Mass and Distance Measurements of Binary Lens System OGLE-2014-BLG-1050L
- OGLE-2015-BLG-1482L: the first isolated low-mass microlens in the Galactic bulge
- OGLE-2011-BLG-0265Lb: a Jovian Microlensing Planet Orbiting an M Dwarf
- Super-massive planets around late-type stars - the case of OGLE-2012-BLG-0406Lb
- A New Non-Planetary Interpretation of the Microlensing Event OGLE-2013-BLG-0723
- OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized by Simultaneous Ground-based and Space-based Observation
- Candidate Gravitational Microlensing Events for Future Direct Lens Imaging
- Signatures of rotating binaries in micro-lensing experiments
- OGLE-2014-BLG-0257L: A Microlensing Brown Dwarf Orbiting a Low-mass M Dwarf
- KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-Low-Mass Primaries
- OGLE-2015-BLG-0196: Ground-based Gravitational Microlens Parallax Confirmed By Space-Based Observation
- OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs
- Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
- OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf
- OGLE-2016-BLG-0693LB: Probing the Brown Dwarf Desert with Microlensing
- OGLE-2012-BLG-0455/MOA-2012-BLG-206: Microlensing event with ambiguity in planetary interpretations caused by incomplete coverage of planetary signal
- Periodic Signals in Binary Microlensing Events
- OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected Through the Channel of a Gravitational Binary-Lens Event
- An analysis of binary microlensing event OGLE-2015-BLG-0060
- Constraint on Additional Planets in Planetary Systems Discovered through the Channel of High-magnification Gravitational Microlensing Events
- Reanalyses of Anomalous Gravitational Microlensing Events in the OGLE-III Early Warning System Database with Combined Data