VBBinaryLensing: a public package for microlensing light-curve computation

Bozza, V.; Bachelet, E.; Bartolić, Fran; Heintz, Tyler M.; Hoag, Ava R.; Hundertmark, M.

doi:10.1093/mnras/sty1791

Cited by 87 publications

(80 citation statements)

References 30 publications

(40 reference statements)

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“…Software: astropy (Astropy Collaboration et al 2013, 2018), Matplotlib (Hunter 2007), MulensModel (Poleski & Yee 2018), VBBinaryLensing (Bozza 2010;Bozza et al 2018).…”

mentioning

confidence: 99%

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. II. Free-floating Planet Detection Rates*

et al. 2020

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The Nancy Grace Roman Space Telescope (Roman) will perform a Galactic Exoplanet Survey (RGES) to discover bound exoplanets with semimajor axes greater than 1 au using gravitational microlensing. Roman will even be sensitive to planetary-mass objects that are not gravitationally bound to any host star. Such free-floating planetarymass objects (FFPs) will be detected as isolated microlensing events with timescales shorter than a few days. A measurement of the abundance and mass function of FFPs is a powerful diagnostic of the formation and evolution of planetary systems, as well as the physics of the formation of isolated objects via direct collapse. We show that Roman will be sensitive to FFP lenses that have masses from that of Mars (0.1 M ⊕) to gas giants (M100 M ⊕) as isolated lensing events with timescales from a few hours to several tens of days, respectively. We investigate the impact of the detection criteria on the survey, especially in the presence of finite-source effects for low-mass lenses. The number of detections will depend on the abundance of such FFPs as a function of mass, which is at present poorly constrained. Assuming that FFPs follow the fiducial mass function of cold, bound planets adapted from Cassan et al., we estimate that Roman will detect ∼250 FFPs with masses down to that of Mars (including ∼60 with masses M ⊕). We also predict that Roman will improve the upper limits on FFP populations by at least an order of magnitude compared to currently existing constraints. Unified Astronomy Thesaurus concepts: Gravitational microlensing (672); Free floating planets (549); Space telescopes (1547); Exoplanet detection methods (489)

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“…Software: astropy (Astropy Collaboration et al 2013, 2018), Matplotlib (Hunter 2007), MulensModel (Poleski & Yee 2018), VBBinaryLensing (Bozza 2010;Bozza et al 2018).…”

mentioning

confidence: 99%

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. II. Free-floating Planet Detection Rates*

et al. 2020

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“…We modeled the light curve of the event using an extended source single-lens model with magnifications calculated using the approach of Bozza et al (2018). In addition to t E and ρ, this model has two geometric parameters, t 0 and u 0 , which describe the moment and separation (in Einstein radius units) during the closest approach between the lens and the center of the source.…”

Section: Single-lens Modelsmentioning

confidence: 99%

“…We calculate finite-source binary-lens magnifications using the method by Bozza (2010) and Bozza et al (2018) as implemented in MulensModel package (Poleski & Yee 2019). We define a wide grid in (s, q) and run separate MCMC (Foreman-Mackey et al 2013) chains with fixed (s, q) at every point in the grid.…”

Section: Binary-lens Models and Variability Of The Sourcementioning

confidence: 99%

A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551

Mróz

Poleski²,

Han

et al. 2020

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High-cadence observations of the Galactic bulge by the microlensing surveys led to the discovery of a handful of extremely short-timescale microlensing events that can be attributed to free-floating or wide-orbit planets. Here, we report the discovery of another strong free-floating planet candidate, which was found from the analysis of the gravitational microlensing event OGLE-2019-BLG-0551. The light curve of the event is characterized by a very short duration (3 days) and a very small amplitude (0.1 mag). From modeling of the light curve, we find that the Einstein timescale, =  t 0.381 0.017 E day, is much shorter, and the angular Einstein radius, q =  4.35 0.34 E μas, is much smaller than those of typical lensing events produced by stellar-mass lenses (t 20 E days, q~0.3 E mas), indicating that the lens is very likely to be a planetary-mass object. We conduct an extensive search for possible signatures of a companion star in the light curve of the event, finding no significant evidence for the putative host star. For the first time, we also demonstrate that the angular Einstein radius of the lens does not depend on blending in the low-magnification events with strong finite source effects.

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“…Independently of ROME/REA, MiNDSTEp observations with the Danish 1.54 m in Chile were triggered automatically by the SIGNALMEN anomaly detector (Dominik et al 2007), operated as part of the ARTEMiS system 35 (Dominik et al 2008(Dominik et al , 2010, in conjunction with real-time modeling of anomalous events provided by RTModel 36 (Bozza et al 2018). They began on 2018 April 25 and continued until 2018 May 18, with the goal of ensuring high-cadence coverage of the anomaly.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

OGLE-2018-BLG-0022: A Nearby M-dwarf Binary

Street¹,

Bachelet²,

Tsapras³

et al. 2019

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We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the Robotic Observations of Microlensing Events (ROME)/Reactive Event Assessment (REA) Survey, which indicate that the lens is a low-mass binary star consisting of M3 (0.375±0.020 M e) and M7 (0.098±0.005 M e) components. The lens is unusually close, at 0.998±0.047 kpc, compared with the majority of microlensing events, and despite its intrinsically low luminosity, it is likely that adaptive optics observations in the near future will be able to provide an independent confirmation of the lens masses.

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VBBinaryLensing: a public package for microlensing light-curve computation

Cited by 87 publications

References 30 publications

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. II. Free-floating Planet Detection Rates*

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. II. Free-floating Planet Detection Rates*

A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551

OGLE-2018-BLG-0022: A Nearby M-dwarf Binary

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