A 1201 s Orbital Period Detached Binary: The First Double Helium Core White Dwarf LISA Verification Binary
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 2020
- DOI:
- 10.3847/2041-8213/ab8228
- arXiv:
- arXiv:2004.00641
- Bibcode:
- 2020ApJ...892L..35B
- Keywords:
-
- Compact binary stars;
- DA stars;
- DC stars;
- Gravitational wave sources;
- Gravitational waves;
- White dwarf stars;
- Compact objects;
- Detached binary stars;
- 283;
- 348;
- 0;
- 677;
- 678;
- 1799;
- 288;
- 375;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies;
- General Relativity and Quantum Cosmology
- E-Print:
- 7 pages, 4 figures, ApJ Letters accepted
