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Microlensing Events in the Galactic Plane Using the Zwicky Transient Facility

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dc.abstract.enMicrolensing is a powerful technique to study the Galactic population of dark" objects such as exoplanets both bound and unbound, brown dwarfs, low-luminosity stars, old white dwarfs, and neutron stars, and it is almost the only way to study isolated stellar-mass black holes. The majority of previous efforts to search for gravitational microlensing events have concentrated toward high-density fields such as the Galactic bulge. Microlensing events in the Galactic plane have the advantage of closer proximity and better constrained relative proper motions, leading to better constrained estimates of lens mass at the expense of a lower optical depth, than events toward the Galactic bulge. We use the Zwicky Transient Facility Data Release 5 compiled from 2018-2021 to survey the Galactic plane in the region of ∣b∣ < 20°. We find a total of 60 candidate microlensing events including three that show a strong microlensing parallax effect. The rate of events traces Galactic structure, decreasing exponentially as a function Galactic longitude with scale length ℓ <SUB>0</SUB> ~ 37°. On average, we find Einstein timescales of our microlensing events to be about three times as long (~60 days) as those toward the Galactic bulge (~20 days). This pilot project demonstrates that microlensing toward the Galactic plane shows strong promise for characterization of dark objects within the Galactic disk."
dc.affiliationUniwersytet Warszawski
dc.contributor.authorShupe, David L.
dc.contributor.authorDekany, Richard
dc.contributor.authorAndreoni, Igor
dc.contributor.authorBellm, Eric C.
dc.contributor.authorGraham, Matthew J.
dc.contributor.authorMasci, Frank J.
dc.contributor.authorDrake, Andrew J.
dc.contributor.authorDuev, Dmitry A.
dc.contributor.authorPrince, Thomas A.
dc.contributor.authorRiddle, Reed
dc.contributor.authorMróz, Przemysław
dc.contributor.authorKulkarni, Shrinivas R.
dc.contributor.authorRodriguez, Antonio C.
dc.date.accessioned2024-01-25T11:28:59Z
dc.date.available2024-01-25T11:28:59Z
dc.date.copyright2022-03-11
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionFINAL_PUBLISHED
dc.description.volume927
dc.identifier.doi10.3847/1538-4357/AC51CC
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112424
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022ApJ...927..150R
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages150
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleMicrolensing Events in the Galactic Plane Using the Zwicky Transient Facility
dc.typeJournalArticle
dspace.entity.typePublication