@article{15223,
  abstract     = {Using photometry collected with the Zwicky Transient Facility, we are conducting an ongoing survey for binary systems with short orbital periods (
 with the goal of identifying new gravitational-wave sources detectable by the upcoming Laser Interferometer Space Antenna (LISA). We present a sample of 15 binary systems discovered thus far, with orbital periods ranging from 6.91 to 56.35 minutes. Of the 15 systems, seven are eclipsing systems that do not show signs of significant mass transfer. Additionally, we have discovered two AM Canum Venaticorum systems and six systems exhibiting primarily ellipsoidal variations in their lightcurves. We present follow-up spectroscopy and high-speed photometry confirming the nature of these systems, estimates of their LISA signal-to-noise ratios, and a discussion of their physical characteristics.},
  author       = {Burdge, Kevin B. and Prince, Thomas A. and Fuller, Jim and Kaplan, David L. and Marsh, Thomas R. and Tremblay, Pier-Emmanuel and Zhuang, Zhuyun and Bellm, Eric C. and Caiazzo, Ilaria and Coughlin, Michael W. and Dhillon, Vik S. and Gaensicke, Boris and Rodríguez-Gil, Pablo and Graham, Matthew J. and Hermes, JJ and Kupfer, Thomas and Littlefair, S. P. and Mróz, Przemek and Phinney, E. S. and Roestel, Jan van and Yao, Yuhan and Dekany, Richard G. and Drake, Andrew J. and Duev, Dmitry A. and Hale, David and Feeney, Michael and Helou, George and Kaye, Stephen and Mahabal, Ashish. A. and Masci, Frank J. and Riddle, Reed and Smith, Roger and Soumagnac, Maayane T. and Kulkarni, S. R.},
  issn         = {1538-4357},
  journal      = {The Astrophysical Journal},
  keywords     = {Space and Planetary Science, Astronomy and Astrophysics},
  number       = {1},
  publisher    = {American Astronomical Society},
  title        = {{A systematic search of Zwicky transient facility data for ultracompact binary LISA-detectable gravitational-wave sources}},
  doi          = {10.3847/1538-4357/abc261},
  volume       = {905},
  year         = {2020},
}