1000 cataclysmic variables identified from DESI spectroscopy
Abstract
Abstract Most cataclysmic variables (CVs) are discovered when they have an outburst generating an inherent selection bias against CVs that rarely, or never, outburst. CVs discovered by virtue of their spectroscopic characteristics are particularly valuable to offset this bias and we have used an established machine-learning technique to assist in searching 98 966 000 spectra obtained by the Dark Energy Spectroscopic Survey (DESI) to find such CVs. DESI observations are much deeper than previous spectroscopic surveys and we have identified 1028 CVs, 221 of which are new including ten of the AMCVn subtype. We have spectroscopically confirmed 440 CV candidates and obtained 85 new or improved orbital periods.We present revised space density estimates based upon this new data. We have also added ten more to the eight known examples of an intriguing class of CVs which exhibit peculiar changes in accretion.
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Authors: Keith Inight, B. T. Gänsicke, A. Aungwerojwit, P. Izquierdo, Christopher J. Manser, A.D. Myers, A. Swan, John R. Thorstensen, Aguilar Jl., Steven P. Ahlen, D Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, Biprateep Dey, P. Doel, A. Font-Ribera, J. E. Forero-Romero, Satya Gontcho A Gontcho, G. Gutierrez, J. Guy, R. Joyce, Stéphanie Juneau, Sergey E. Koposov, A. Kremin, Martin Landriau, Laurent Le Guillou, Aaron Meisner, R. Miquel, J. Moustakas, J. Najita, Ignasi Pérez-Ràfols, Will J. Percival, F. Prada, G. Rossi, E. J. Sanchez, D. Schlegel, M. Schubnell, H. Seo, J. Silber, G. Tarlé, B A Weaver, R. Zhou, H. Zou
Institutions: University of Pittsburgh, Universidad Nacional Autónoma de México, Chinese Academy of Sciences, University of Virginia, University of Michigan, University of Toronto, Boston University, University College London, University of Edinburgh, Ohio University, Dartmouth College, Sorbonne Université, University of Cambridge, Centre National de la Recherche Scientifique, University of Waterloo, Institució Catalana de Recerca i Estudis Avançats, University of Wyoming, Universitat Politècnica de Catalunya, University of Milan, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Sejong University, University of Warwick, National Astronomical Observatories, Naresuan University, Lawrence Berkeley National Laboratory, Fermi National Accelerator Laboratory, NSF NOIRLab, Instituto de Astrofísica de Andalucía, Institut National de Physique Nucléaire et de Physique des Particules, Universidad de Los Andes, Royal Observatory, Brera Astronomical Observatory, Institute for High Energy Physics, Perimeter Institute, Barcelona Institute of Science and Technology, Laboratoire de Physique Nucléaire et de Hautes Énergies