Discovery of the first resolved triple white dwarf

@article{PerpinyValls2018DiscoveryOT,
  title={Discovery of the first resolved triple white dwarf},
  author={Mart{\'i} Perpiny{\`a}-Vall{\`e}s and Alberto Rebassa-Mansergas and Boris T. G{\"a}nsicke and Silvia Toonen and J. J. Hermes and Nicola Pietro Gentile Fusillo and P. E. Tremblay},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018}
}
We report the discovery of J1953–1019, the first resolved triple white dwarf system. The triplet consists of an inner white dwarf binary and a wider companion. Using Gaia DR2 photometry and astrometry combined with our follow-up spectroscopy, we derive effective temperatures, surface gravities, masses, and cooling ages of the three components. All three white dwarfs have pure-hydrogen (DA) atmospheres, masses of 0.60--0.63M⊙⁠, and cooling ages of 40–290 Myr. We adopt eight initial-to-final mass… 

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