THE DISCOVERY OF BINARY WHITE DWARFS THAT WILL MERGE WITHIN 500 Myr

@article{Kilic2010THEDO,
  title={THE DISCOVERY OF BINARY WHITE DWARFS THAT WILL MERGE WITHIN 500 Myr},
  author={Mukremin Kilic and Warren R. Brown and Carlos Allende Prieto and Scott J. Kenyon and Jorge A. Panei},
  journal={The Astrophysical Journal},
  year={2010},
  volume={716},
  pages={122 - 130}
}
We present radial velocity observations of four extremely low-mass (0.2 M☉) white dwarfs (WDs). All four stars show peak-to-peak radial velocity variations of 540–710 km s−1 with 1.0–5.9 hr periods. The optical photometry rules out main-sequence companions. In addition, no millisecond pulsar companions are detected in radio observations. Thus, the invisible companions are most likely WDs. Two of the systems are the shortest period binary WDs yet discovered. Due to the loss of angular momentum… 

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