  We report the discovery of a detached 20 min orbital period binary white
dwarf. WD0931+444 (SDSS J093506.93+441106.9) was previously classified as a WD
+ M dwarf system based on its optical spectrum. Our time-resolved optical
spectroscopy observations obtained at the 8m Gemini and 6.5m MMT reveal
peak-to-peak radial velocity variations of 400 km/s every 20 min for the WD,
but no velocity variations for the M dwarf. In addition, high-speed photometry
from the McDonald 2.1m telescope shows no evidence of variability nor evidence
of a reflection effect. An M dwarf companion is physically too large to fit
into a 20 min orbit. Thus, the orbital motion of the WD is almost certainly due
to an invisible WD companion. The M dwarf must be either an unrelated
background object or the tertiary component of a hiearchical triple system.
WD0931+444 contains a pair of WDs, a 0.32 Msol primary and a >0.14 Msol
secondary, at a separation of >0.19 Rsol. After J0651+2844, WD0931+444 becomes
the second-shortest period detached binary WD currently known. The two WDs will
lose angular momentum through gravitational wave radiation and merge in <9 Myr.
The log h ~ -22 gravitational wave strain from WD0931+444 is strong enough to
make it a verification source for gravitational wave missions in the
milli-Hertz frequency range, e.g. the evolved Laser Interferometer Space
Antenna (eLISA), bringing the total number of known eLISA verification sources
to nine.
