Keywords: binaries: close — Galaxy: stellar content — white dwarfs
1. INTRODUCTION
2. DATA
2.1. Target Selection
2.2. Survey Design
2.3. Spectroscopy
2.4. Stellar Atmosphere Fits
2.5. Gaia Astrometry
2.6. White Dwarf Parameters
2.7. Clean ELM WD Sample
2.8. White Dwarf Disk/Halo Membership
3. BINARIES
3.1. Velocity Variability
3.2. Binary Orbital Elements
3.3. Millisecond Pulsar Companions
3.4. Optical Light Curve
4. DISCUSSION
4.1. ELM WD Binary Fraction
4.2. Orbital Period Distribution
4.3. Mass-Period Distribution: Link to Formation
4.4. He+CO Merger Rate: Link to Outcomes
4.5. Gravitational Wave Sources
5. CONCLUSIONS