One Thousand New Dwarf Novae from the OGLE Survey

TL;DR

This paper reports the discovery of over a thousand dwarf novae from the OGLE survey, analyzes their properties, identifies various subtypes, and introduces a new real-time monitoring system for these variable stars.

Contribution

It presents one of the largest collections of dwarf novae, identifies candidate subtypes, and introduces a new real-time photometric monitoring system for CVs.

Findings

Discovery of 1091 dwarf novae from OGLE data.

Identification of WZ Sge-type candidates and other subtypes.

Introduction of the CVOM real-time monitoring system.

Abstract

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. 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. 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.