A White Dwarf with Transiting Circumstellar Material Far outside the Roche Limit

@article{Vanderbosch2019AWD,
  title={A White Dwarf with Transiting Circumstellar Material Far outside the Roche Limit},
  author={Zach Vanderbosch and J. J. Hermes and Erik Dennihy and Bart H. Dunlap and Paula Izquierdo and P. E. Tremblay and P. B. Cho and Boris T. G{\"a}nsicke and Odette Toloza and Keaton J. Bell and Michael H. Montgomery and Don E. Winget},
  journal={The Astrophysical Journal},
  year={2019},
  volume={897}
}
We report the discovery of a white dwarf exhibiting deep, irregularly shaped transits, indicative of circumstellar planetary debris. Using Zwicky Transient Facility DR2 photometry of ZTF J013906.17+524536.89 and follow-up observations from the Las Cumbres Observatory, we identify multiple transit events that recur every ≈107.2 days, much longer than the 4.5–4.9 hr orbital periods observed in WD 1145+017, the only other white dwarf known with transiting planetary debris. The transits vary in… 

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