Abstract
We report the discovery of a 1201 s orbital period binary, the third shortest-period detached binary known. Sloan Digital Sky Survey J232230.20 + 050942.06 contains two He-core white dwarfs orbiting with a 27° inclination. Located 0.76 kpc from the Sun, the binary has an estimated Laser Interferometer Space Antenna (LISA) 4 yr signal-to-noise ratio of 40. J2322 + 0509 is the first He + He white dwarf LISA verification binary, a source class that is predicted to account for one-third of resolved LISA ultra-compact binary detections.
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CITATION STYLE
Brown, W. R., Kilic, M., Bédard, A., Kosakowski, A., & Bergeron, P. (2020). A 1201 s Orbital Period Detached Binary: The First Double Helium Core White Dwarf LISA Verification Binary. The Astrophysical Journal Letters, 892(2), L35. https://doi.org/10.3847/2041-8213/ab8228
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