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arXiv · 2207.02998

The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint

Warren R. Brown·Mukremin Kilic·Alekzander Kosakowski·A. Gianninas
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Abstract

We present the discovery of 17 double white dwarf (WD) binaries from our on-going search for extremely low mass (ELM) <0.3 Msun WDs, objects that form from binary evolution. Gaia parallax provides a new means of target selection that we use to evaluate our original ELM Survey selection criteria. Cross-matching the Gaia and Sloan Digital Sky Survey (SDSS) catalogs, we identify an additional 36 ELM WD candidates with 17<g<19 mag and within the 3-sigma uncertainties of our original color selection. The resulting discoveries imply the ELM Survey sample was 90% complete in the color range -0.4 < (g-r)_0 < -0.1 mag (approximately 9,000 K < Teff < 22,000 K). Our observations complete the sample in the SDSS footprint. Two newly discovered binaries, J123950.370-204142.28 and J232208.733+210352.81, have orbital periods of 22.5 min and 32 min, respectively, and are future LISA gravitational wave sources.

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Warren R. Brown, Mukremin Kilic, Alekzander Kosakowski, A. Gianninas. 2022-07-06. The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint. https://doi.org/10.3847/1538-4357%2Fac72ac

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