Program: GS-2019A-FT-202

We have recently performed a detailed spectroscopic and photometric model atmosphere analysis of 158 white dwarfs for which precise trigonometric parallax measurements are available. Based on this analysis, we identify 15 double degenerates in the solar neighborhood, six of which were previously confirmed to be in short period systems. The remaining nine objects are excellent binary candidates as well. We were granted Gemini time in 2018A/2018B to follow-up four of these targets over 2 hours each, and identified two double-lined and one single-lined spectroscopic binary systems. Here we request Gemini Fast Turnaround time to sample the velocity curves for two of these targets (that are visible in April-June) over multiple nights to constrain their orbital periods, component masses, gravitational wave merger times, and to confirm or rule out supernova Ia progenitors. This FT program will enable us to publish the results from our Gemini 2018A/B programs.