Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye

Abstract

Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve exhibited five distinct brightening episodes, reaching up to I=12 mag, and it was covered in great detail with almost 25,000 data points gathered by a network of telescopes. We present the photometric and spectroscopic follow-up covering 500 days of the event evolution. We employed a full Keplerian binary orbit microlensing model combined with the motion of Earth and Gaia around the Sun to reproduce the complex light curve. The photometric data allowed us to solve the microlensing event entirely and to derive the complete and unique set of orbital parameters of the binary lensing system. We also report on the detection of the first-ever microlensing space-parallax between the Earth and Gaia located at L2. The properties of the binary system were derived from microlensing parameters, and we found that the system is composed of two main-sequence stars with masses 0.57$\pm$0.05 $M_{\odot }$ and 0.36$\pm$0.03 $M_{\odot }$ at 780 pc, with an orbital period of 2.88 years and an eccentricity of 0.30. We also predict the astrometric microlensing signal for this binary lens as it will be seen by Gaia as well as the radial velocity curve for the binary system. Events such as Gaia16aye indicate the potential for the microlensing method of probing the mass function of dark objects, including black holes, in directions other than that of the Galactic bulge. This case also emphasises the importance of long-term time-domain coordinated observations that can be made with a network of heterogeneous telescopes.

accepted for publication in A&A, 24 pages, 10 figures, tables with the data will be available electronically

References in corpus (75)

• emcee: The MCMC Hammer
• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Las Cumbres Observatory Global Telescope Network
• Did LIGO detect dark matter?
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• The first gravitational-wave source from the isolated evolution of two 40-100 Msun stars
• Gaia Data Release 2: Photometric content and validation
• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• No large population of unbound or wide-orbit Jupiter-mass planets
• Gravitational Microlensing in the Local Group
• A Jovian-mass Planet in Microlensing Event OGLE-2005-BLG-071
• A Natural Formalism for Microlensing
• Gaia Radial Velocity Spectrometer
• The MACHO Project: 45 Candidate Microlensing Events from the First Year Galactic Bulge Data
• Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
• Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41
• The 1995 Pilot Campaign of PLANET: Searching for Microlensing Anomalies through Precise, Rapid, Round-the-Clock Monitoring
• The Extreme Microlensing Event OGLE-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf
• Spitzer as Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star
• Black Hole, Neutron Star and White Dwarf Candidates from Microlensing with OGLE-III
• Gaia Data Release 2: Processing the spectroscopic data
• The Gaia FGK Benchmark Stars - High resolution spectral library
• Accurate dynamical mass determination of a classical Cepheid in an eclipsing binary system
• The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
• Galactic Bulge Microlensing Optical Depth from EROS-2
• Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet
• The Optical Gravitational Lensing Experiment. OGLE #7: Binary Microlens or a New Unusual Variable?
• Synthetic Spectra and Color-Temperature Relations of M Giants
• The Microlensing Event Rate and Optical Depth Toward the Galactic Bulge from MOA-II
• OGLE-III Microlensing Events and the Structure of the Galactic Bulge
• Astrometric Microlensing with the GAIA satellite
• First Space-based Microlens Parallax Measurement of an Isolated Star: Spitzer Observations of OGLE-2014-BLG-0939
• Predicting Stellar Angular Diameters from $V$, $I_C$, $H$, $K$ Photometry
• First Resolution of Microlensed Images
• A Search for Stellar-Mass Black Holes via Astrometric Microlensing
• Mass Measurements of Isolated Objects from Space-based Microlensing
• Observation of Microlensing towards the Galactic Spiral Arms. EROS II 3 year survey
• On the accuracy of mass measurement for microlensing black holes as seen by Gaia and OGLE
• Spitzer Microlens Measurement of a Massive Remnant in a Well-Separated Binary
• Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
• The EROS2 search for microlensing events towards the spiral arms: the complete seven season results
• Characterizing Low-Mass Binaries From Observation of Long Time-scale Caustic-crossing Gravitational Microlensing Events
• The first direct detection of a gravitational micro-lens toward the Galactic bulge
• pt5m - a 0.5m robotic telescope on La Palma
• Discovery of a bright microlensing event with planetary features towards the Taurus region: a super Earth planet
• Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
• NELIOTA: The wide-field, high-cadence lunar monitoring system at the prime focus of the Kryoneri telescope
• Microlensing constraints on the mass of single stars from HST astrometric measurements
• Microlens Mass Measurement using Triple-Peak Events
• First simultaneous microlensing observations by two space telescopes: $Spitzer$ & $Swift$ reveal a brown dwarf in event OGLE-2015-BLG-1319
• Discovery of a Very Bright, Nearby Gravitational Microlensing Event
• Spitzer Microlensing Program as a Probe for Globular Cluster Planets. Analysis of OGLE-2015-BLG-0448
• Two Stars Two Ways: Confirming a Microlensing Binary Lens Solution with a Spectroscopic Measurement of the Orbit
• Repeating microlensing events in the OGLE data
• Near-Field Microlensing from Wide-Field Surveys
• The DEdicated MONitor of EXotransits and Transients (DEMONEXT): System Overview and Year One Results from a Low-Cost Robotic Telescope for Follow-Up of Exoplanetary Transits and Transients
• Rapidly Rotating Lenses: Repeating features in the lightcurves of short period binary microlenses
• Observation of the first gravitational microlensing event in a sparse stellar field : the Tago event
• Microlensing Parallax for Observers in Heliocentric Motion
• The first radial velocity measurements of a microlensing event: no evidence for the predicted binary
• Trajectories of the images in binary microlensing
• OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-Peak Gravitational Microlensing Event
• Reconciling the predictions of microlensing analysis with radial velocity measurements for OGLE-2011-BLG-0417
• OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in $\lesssim 5$ years from High-resolution Follow-up Observations
• Microlensing of close binary stars

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