OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-Peak Gravitational Microlensing Event

Abstract

We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits very unusual five peaks where four peaks were produced by caustic crossings and the other peak was produced by a cusp approach. It is found that the quintuple-peak features of the light curve provide tight constraints on the source trajectory, enabling us to precisely and accurately measure the microlensing parallax ${\pi }_{\mathrm{E}}$. Furthermore, the three resolved caustics allow us to measure the angular Einstein radius $\thetae$. From the combination of ${\pi }_{\mathrm{E}}$ and $\thetae$, the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses $M_1=0.52\pm 0.04M_{\odot }$ and $M_2=0.42\pm 0.03M_{\odot }$ separated in projection by $a_{\perp }=6.4\pm 0.5$ au. The lens is located in the disk with a distance of $D_{\mathrm{L}}=3.3\pm 0.3$~kpc. It turns out that the reason for the absence of a lensing signal in the {\it Spitzer} data is that the time of observation corresponds to the flat region of the light curve.

arXiv comment10 pages, 7 figures

References in corpus (27)

• A method for optimal image subtraction
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
• A Natural Formalism for Microlensing
• Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
• Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
• A New Algorithm For Difference Image Analysis
• 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
• Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41
• Finite Source Sizes and the Information Content of MACHO-Type Lens Search Light Curves
• Spitzer as Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star
• Systematic Analysis of 22 Microlensing Parallax Candidates
• Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events
• Spitzer Parallax of OGLE-2015-BLG-0966: A Cold Neptune in the Galactic Disk
• Probable Gravitational Microlensing towards the Galatic Bulge
• Mass Measurements of Isolated Objects from Space-based Microlensing
• 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
• Microlens Mass Measurement using Triple-Peak Events
• Planetary microlensing signals from the orbital motion of the source star around the common barycentre
• OGLE-2014-BLG-0257L: A Microlensing Brown Dwarf Orbiting a Low-mass M Dwarf
• Space-based Microlens Parallax Observation As a Way to Resolve the Severe Degeneracy between Microlens-parallax and Lens-orbital Effect

Cited by in corpus (8)

• Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye
• Pixel Level Decorrelation in Service of the \textit{Spitzer} Microlens Parallax Survey
• An analysis of binary microlensing event OGLE-2015-BLG-0060
• KMT-2016-BLG-2052L: Microlensing Binary Composed of M Dwarfs Revealed from a Very Long Time-scale Event
• MOA-2019-BLG-008Lb: a new microlensing detection of an object at the planet/brown dwarf boundary
• OGLE-2016-BLG-0156: Microlensing Event With Pronounced Microlens-Parallax Effects Yielding Precise Lens Mass Measurement
• RTModel: a platform for real-time modeling and massive analysis of microlensing events
• Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes