Program: GS-2023A-Q-316

The multiplicity properties of the white dwarf (WD) population have crucial implications to a variety of astrophysical phenomena, from binary evolution, through Type-Ia supernova, to gravitational-wave sources. Double WDs with orbital separations on the order of ~1-100AU are challenging to find observationally with spectroscopy or with astrometry. For this reason, the binarity of the otherwise well-studied volume-complete 20pc WD sample has yet to be systematically probed. We propose the first systematic search for the binarity of the full 20pc WD sample, in the ~1-20AU separation range, using speckle imaging with `Alopeke and Zorro. This will allow us to probe the binarity in an orbital separation range that is complementary to that of Gaia, and to observationally constrain the theoretical models of binary interaction.