NOAO >   Observing Info >   Approved Programs >   2017B-0053

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Program Information for 2017B-0053


PI: Paula Szkody, U. of Washington, szkody@astro.washington.edu
Address: Astronomy Department, Box 351580, Seattle, WA 98195 USA

CoI: David Buckley, SAAO
CoI: John Thorstensen, Dartmouth College
CoI: Stephen Potter, SAAO
CoI: Thomas Kupfer, California Institute of Technology

Title: Targeting Candidate Cataclysmic Variables in Current Transient Surveys

Abstract: Our program aims to accomplish followup photometry and spectroscopy of newly discovered candidate cataclysmic variables (CVs) in current optical sky surveys (CRTS, MASTER, ASAS-SN), with particular emphasis on low luminosity, short period dwarf novae that have infrequent outbursts, related period bouncers and systems containing highly magnetic white dwarfs. These objects are crucial for understanding the nature of close binary evolution, particularly at the shortest orbital periods (60-90 min). In addition, the rare but important class of double-degenerate systems, potential progenitors of Type Ia SN are also potential candidates from these surveys. The primary goals are to obtain spectra to confirm the CV nature and delineate the object types, and obtain light curves to find the orbital periods, an essential key parameter to determine the evolutionary status. We need to accumulate large numbers to test population model predictions for angular momentum loss and evolution. For this reason, we request long term status to accumulate data for about 100 systems, using 3 hr continuous photometry (in g and r) for 2-3 objects/ month and spectra of about 4/month throughout the 3 yr program. We will use larger telescope access by the PI and CoIs at APO, MDM, Caltech and SAAO to accomplish radial velocities of the most interesting targets determined by LCO. This first year will serve as a testbed for the addition of ZTF candidates at the end of 2017.

Program Type: Standard/LCO

Scheduled Nights:
Run 1 (2017B):  LCO-2m/FLOYDS -- 16hrs
Run 2 (2017B):  LCO-1m/Sinistro -- 48hrs


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017B-0053

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