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We carry out high-speed photometry on 20 of the shortest-period, detachedwhite dwarf binaries known and discover systems with eclipses, ellipsoidalvariations (due to tidal deformations of the visible white dwarf), and Dopplerbeaming. All of the binaries contain low-mass white dwarfs with orbital periodsless than 4 hr. Our observations identify the first eight tidally distortedwhite dwarfs, four of which are reported for the first time here, which we useto put empirical constraints on the mass-radius relationship for extremelylow-mass (<0.30 Msun) white dwarfs. We also detect Doppler beaming in severalof these binaries, which confirms the high-amplitude radial-velocityvariability. All of these systems are strong sources of gravitationalradiation, and long-term monitoring of those that display ellipsoidalvariations can be used to detect spin-up of the tidal bulge due to orbitaldecay.

Radius constraints from high-speed photometry of 20 low-mass white dwarf binaries