A 1201 s Orbital Period Detached Binary: The First Double Helium Core White Dwarf LISA Verification Binary
Warren R. Brown, Mukremin Kilic, A. Bédard, Alekzander Kosakowski, P. Bergeron
Abstract
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.
Topics & Concepts
PhysicsWhite dwarfOrbital periodBinary numberAstronomyAstrophysicsCore (optical fiber)Orbital elementsSkyBinary starBinary systemInterferometryHeliumWhite (mutation)Binary black holePeriod (music)X-ray binaryOrbit (dynamics)SubdwarfStellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchAstrophysical Phenomena and Observations