A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary

Warren R. Brown; Mukremin Kilic; A. Bedard; Alekzander Kosakowski; P. Bergeron

doi:10.3847/2041-8213/ab8228

A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary

Solar and Stellar Astrophysics 2020-04-15 v1 Astrophysics of Galaxies General Relativity and Quantum Cosmology

Authors: Warren R. Brown , Mukremin Kilic , A. Bedard , Alekzander Kosakowski , P. Bergeron

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Abstract

We report the discovery of a 1201 s orbital period binary, the third shortest-period detached binary known. SDSS J232230.20+050942.06 contains two He-core white dwarfs orbiting with a 27 deg inclination. Located 0.76 kpc from the Sun, the binary has an estimated 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.

Keywords

eclipsing binary stars cataclysmic variable orbital periods white dwarfs

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@article{arxiv.2004.00641,
  title  = {A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary},
  author = {Warren R. Brown and Mukremin Kilic and A. Bedard and Alekzander Kosakowski and P. Bergeron},
  journal= {arXiv preprint arXiv:2004.00641},
  year   = {2020}
}

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7 pages, 4 figures, ApJ Letters accepted

A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary

Abstract

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