A new gravitational wave verification source

@article{Kilic2014ANG,
  title={A new gravitational wave verification source},
  author={M. Kilic and Warren R. Brown and A. Gianninas and J. Hermes and C. Prieto and S. Kenyon},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={444},
  pages={1}
}
We report the discovery of a detached 20 min orbital period binary white dwarf. WD 0931+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 1 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… Expand
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