Journal
ASTRONOMICAL JOURNAL
Volume 159, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/ab7cce
Keywords
Astronomical object identification; Compact binary stars; Spectroscopy; Dwarf novae
Categories
Funding
- NSF [1106171, AST-1514737, AST-1440341]
- National Science Foundation Graduate Research Fellowship [DGE-1144469]
- David and Ellen Lee Prize Postdoctoral Fellowship at the California Institute of Technology
- DIRAC Institute in the Department of Astronomy at the University of Washington
- Observatoire de la Cote d'Azur
- National Science Foundation [1545949]
- Caltech, IPAC
- Weizmann Institute for Science
- Oskar Klein Center at Stockholm University
- University of Maryland
- University of Washington
- Deutsches Elektronen-Synchrotron and Humboldt University
- Los Alamos National Laboratories
- TANGO Consortium of Taiwan
- University of Wisconsin at Milwaukee
- Lawrence Berkeley national Laboratories
- UK Science and Technology Facilities Council
- STFC [ST/S006176/1, ST/P006892/1] Funding Source: UKRI
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Using selection criteria based on amplitude, time, and color, we have identified 329 objects as known or candidate cataclysmic variables (CVs) during the first year of testing and operation of the Zwicky Transient Facility. Of these, 90 are previously confirmed CVs, 218 are strong candidates based on the shape and color of their light curves obtained during 3-562 days of observation, and the remaining 21 are possible CVs but with too few data points to be listed as good candidates. Almost half of the strong candidates are within 10 deg of the galactic plane, in contrast to most other large surveys that have avoided crowded fields. The available Gaia parallaxes are consistent with sampling the low mass transfer CVs, as predicted by population models. Our follow-up spectra have confirmed Balmer/helium emission lines in 27 objects, with four showing high-excitation He ii emission, including candidates for an AM CVn, a polar, and an intermediate polar. Our results demonstrate that a complete survey of the Galactic plane is needed to accomplish an accurate determination of the number of CVs existing in the Milky Way.
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