The Variable Sky Through the OGLE Eye

Abstract

The Optical Gravitational Lensing Experiment (OGLE) is one of the most productive and influential photometric sky surveys in the history of observational astronomy. Originally designed to detect dark matter through gravitational microlensing events, OGLE has evolved into a cornerstone of time-domain astrophysics, delivering three decades of two-band, high-cadence observations of approximately two billion stars across the Galactic bulge, disk, and Magellanic System. This review summarizes OGLE's key contributions to variable star research, including the discovery, classification and characterization of pulsating stars, eclipsing, ellipsoidal, and rotating variables, or irregular and eruptive stars. Particular emphasis is placed on the OGLE Collection of Variable Stars (OCVS), a publicly available and systematically expanded dataset that has become a fundamental resource for studies of stellar variability and evolution, Milky Way and other galaxies structure, microlensing, compact objects, exoplanets and more. The synergy between OGLE and other major sky surveys, including ASAS, ASAS-SN, ATLAS, Gaia, KMTNet, MACHO, MOA, TESS, PLATO, or ZTF further amplifies its scientific reach.

arXiv commentReview paper published in the Special Issue of the journal Universe: "Variable Stars in the 21st Century: From Microvariability to Megavariability". 24 pages, 12 figures, 1 table

References in corpus (51)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• A method for optimal image subtraction
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Possible Gravitational Microlensing of a Star in the Large Magellanic Cloud
• A distance to the Large Magellanic Cloud that is precise to one per cent
• One or more bound planets per Milky Way star from microlensing observations
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• No large population of unbound or wide-orbit Jupiter-mass planets
• Unified Rotation Curve of the Galaxy -- Decomposition into de Vaucouleurs Bulge, Disk, Dark Halo, and the 9-kpc Rotation Dip --
• A three-dimensional map of the Milky Way using classical Cepheid variable stars
• Deciphering the 3D structure of the old Galactic bulge from the OGLE RR Lyrae stars
• Rotation curve of the Milky Way from Classical Cepheids
• OGLE-IV: Fourth Phase of the Optical Gravitational Lensing Experiment
• The Optical Gravitational Lensing Experiment. OGLE #7: Binary Microlens or a New Unusual Variable?
• Blue large-amplitude pulsators as a new class of variable stars
• The MACHO Project LMC Variable Star Inventory IV: Multimode RR Lyrae Stars, Distance to the LMC and Age of the Oldest Stars
• Active Learning to Overcome Sample Selection Bias: Application to Photometric Variable Star Classification
• The stellar mass distribution of the Milky Way's bar: an analytic model
• Scalable End-to-end Recurrent Neural Network for Variable star classification
• Deep multi-survey classification of variable stars
• Binarity as the Origin of Long Secondary Periods in Red Giant Stars
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• OGLE-2013-SN-079: a lonely supernova consistent with a helium shell detonation
• The OGLE Collection of Variable Stars. Classical, Type II, and Anomalous Cepheids toward the Galactic Center
• Optical Gravitational Lensing Experiment. OGLE-2 -- the Second Phase of the OGLE Project
• A free-floating or wide-orbit planet in the microlensing event OGLE-2019-BLG-0551
• The Light Curve Shapes as a Key to Resolving the Origin of Long Secondary Periods in Red Giant Stars
• The Optical Gravitational Lensing Experiment. Final Reductions of the OGLE-III Data
• Did the ancient egyptians record the period of the eclipsing binary Algol - the Raging one?
• The OGLE Collection of Variable Stars. Type II Cepheids in the Magellanic System
• Mid-Infrared Period$-$Luminosity Relations for Miras in the Large Magellanic Cloud
• A Machine Learning Classifier for Microlensing in Wide-Field Surveys
• A three-dimensional map of the Milky Way using 66,000 Mira variable stars
• $12660$ spotted stars toward the OGLE Galactic bulge fields
• Type II Cepheids Pulsating in the First Overtone from the OGLE Survey
• The Optical Gravitational Lensing Experiment. Search for Planetary and Low-Luminosity Object Transits in the Galactic Disk. Results of 2001 Campaign
• OGLE-ing the Magellanic System: Cepheids in the Bridge
• Concluding Henrietta Leavitt's Work on Classical Cepheids in the Magellanic System and Other Updates of the OGLE Collection of Variable Stars
• Application of Convolutional Neural Networks to time domain astrophysics. 2D image analysis of OGLE light curves
• OGLE-GAL-ACEP-091 -- The First Known Multi-Mode Anomalous Cepheid
• Three-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?
• Observational Parameters of Blue Large-amplitude Pulsators
• Bright but slow - Type II supernovae from OGLE-IV - Implications for magnitude limited surveys
• Millinovae: A New Class of Transient Supersoft X-ray Sources without a Classical Nova Eruption
• The Legacy of Henrietta Leavitt: A Re-analysis of the First Cepheid Period-Luminosity Relation
• The Mira discovery problem -- Observations by David Fabricius in 1596 and 1609 (and by others before?): Positional accuracy, brightness, color index, and period
• THE OPTICAL GRAVITATIONAL LENSING EXPERIMENT. THE CATALOG OF PERIODIC VARIABLE STARS IN THE GALACTIC BULGE. I. PERIODIC VARIABLES IN THE CENTER OF THE BAADE'S WINDOW.
• Heartbeat Stars Recognition Based on Recurrent Neural Networks: Method and Validation
• The OGLE Collection of Variable Stars: Over 18 000 Rotating Variables toward the Galactic Bulge
• The Optical Gravitational Lensing Experiment. The Catalog of Periodic Variable Stars in the Galactic Bulge. V. Periodic Variables in Fields: MM5-A, MM5-B, MM7-A and MM7-B