Periodic Signals in Binary Microlensing Events

Guo, Xinyi; Esin, A. A.; Stefano, Rosanne Di; Taylor, J. M.

doi:10.1088/0004-637x/809/2/182

Cited by 24 publications

(3 citation statements)

References 31 publications

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“…Thus, their microlensing light curves will consist of a quasiperiodic perturbation superimposed on the standard curve produced by a single lens of the same total mass (e.g. Guo et al (2015)). Our fiducial model corresponds to an orbital period of 8.4 days; therefore, the quasi-symmetric period of the lensing signal will be 4.2 days.…”

Section: Methodsmentioning

confidence: 99%

Detecting binarity of GW150914-like lenses in gravitational microlensing events

Eilbott¹,

Riley²,

Cohn³

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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The recent discovery of gravitational waves (GWs) from stellar-mass binary black holes (BBHs) provided direct evidence of the existence of these systems. BBH lenses would have gravitational microlensing signatures that are distinct from single-lens signals. We apply Bayesian statistics to examine the distinguishability of BBH microlensing events from single-lens events under ideal observing conditions, using the photometric capabilities of the Korean Microlensing Telescope Network. Given one year of observations, a source star at the Galactic Centre, a GW150914-like BBH lens (total mass 65M , mass ratio 0.8) at half that distance, and an impact parameter of 0.4 Einstein radii, we find that binarity is detectable for BBHs with separations down to 0.0250 Einstein radii, which is nearly 3.5 times greater than the maximum separation for which such BBHs would merge within the age of the Universe. Microlensing searches are thus sensitive to more widely separated BBHs than GW searches, perhaps allowing the discovery of BBH populations produced in different channels of binary formation.

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Section: Methodsmentioning

confidence: 99%

Detecting binarity of GW150914-like lenses in gravitational microlensing events

Eilbott¹,

Riley²,

Cohn³

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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“…The majority of observed microlensing light curves have the general appearance expected for the µLens-Single model. Simulated µLens-Binary light curves, however, exhibit great variety, including asymmetries, multiple peaks, plateaus, and quasiperiodic behavior (Mao & Paczynski 1991;Mao & Di Stefano 1995;Guo et al 2015). Caustic crossing light curves exhibit sharp variations in magnification, and this µLens-Binary feature has been commonly observed (Udalski et al 1994).…”

Section: Technical Details For µLens-singlementioning

confidence: 99%

Models and Simulations for the Photometric LSST Astronomical Time Series Classification Challenge (PLAsTiCC)

Kessler

Narayan

Avelino

et al. 2019

PASP

113

114

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We describe the simulated data sample for the "Photometric LSST Astronomical Time Series Classification Challenge" (PLAsTiCC), a publicly available challenge to classify transient and variable events that will be observed by the Large Synoptic Survey Telescope (LSST), a new facility expected to start in the early 2020s. The challenge was hosted by Kaggle, ran from 2018 September 28 to 2018 December 17, and included 1,094 teams competing for prizes. Here we provide details of the 18 transient and variable source models, which were not revealed until after the challenge, and release the model libraries at https://doi.org/10.5281/zenodo.2612896. We describe the LSST Operations Simulator used to predict realistic observing conditions, and we describe the publicly available SNANA simulation code used to transform the models into observed fluxes and uncertainties in the LSST passbands (ugrizy). Although PLAsTiCC has finished, the publicly available models and simulation tools are being used within the astronomy community to further improve classification, and to study contamination in photometrically identified samples of type Ia supernova used to measure properties of dark energy. Our simulation framework will continue serving as a platform to improve the PLAsTiCC models, and to develop new models.

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“…This also implies that despite the binary star causing some motion of the planetary caustics, except in certain cases, caustic motion will usually be dominated by the motion caused by the planet's orbital motion. It is worth noting however, that the orbital motion of the binary may instead be detectable as a so-called rapidly rotating lens (Penny et al 2011a;Nucita et al 2014;Guo et al 2015).…”

Section: General Orbitsmentioning

confidence: 99%

Caustic Structures and Detectability of Circumbinary Planets in Microlensing

Luhn

Penny

Gaudi

2016

ApJ

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Recent discoveries of circumbinary planets in Kepler data show that there is a viable channel of planet formation around binary main sequence stars. Motivated by these discoveries, we have investigated the caustic structures and detectability of circumbinary planets in microlensing events. We have produced a suite of animations of caustics as a function of the projected separation and angle of the binary host to efficiently explore caustic structures over the entire circumbinary parameter space. Aided by these animations, we have derived a semi-empirical analytic expression for the location of planetary caustics, which are displaced in circumbinary lenses relative to those of planets with a single host. We have used this expression to show that the dominant source of caustic motion will be due to the planet's orbital motion and not that of the binary star. Finally, we estimate the fraction of circumbinary microlensing events that are recognizable as such to be significant (5-50 percent) for binary projected separations in the range 0.1-0.5 in units of Einstein radii.

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Periodic Signals in Binary Microlensing Events

Cited by 24 publications

References 31 publications

Detecting binarity of GW150914-like lenses in gravitational microlensing events

Detecting binarity of GW150914-like lenses in gravitational microlensing events

Models and Simulations for the Photometric LSST Astronomical Time Series Classification Challenge (PLAsTiCC)

Caustic Structures and Detectability of Circumbinary Planets in Microlensing

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