We present one of the largest collections of dwarf novae (DNe)
containing 1091 objects that have been discovered in the long-term
photometric data from the Optical Gravitational Lensing Experiment
(OGLE) survey. They were found in the OGLE fields toward the Galactic
bulge and the Magellanic Clouds. We analyze basic photometric
properties of all systems and tentatively find a population of DNe
from the Galactic bulge.
Examples of long-term light curves of dwarf novae.
We identify several dozen of WZ Sge-type DN candidates, including two with superhump periods longer than 0.09 d. Other interesting objects include SU UMa-type stars with "early" precursor outbursts or a Z Cam-type star showing outbursts during standstills.
Examples of light curves of WZ Sge-type dwarf novae.
Light curve of OGLE-BLG504.12.201843.
We also provide a list of DNe which will be observed during the K2 Campaign 9 microlensing experiment in 2016. Finally, we present the new OGLE-IV real-time data analysis system: CVOM, which has been designed to provide continuous real time photometric monitoring of selected CVs.
The time-series photometry of objects presented in this paper is available from the OGLE Internet Archive.
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