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Double White Dwarf Binaries in SDSS-V DR19: A Catalog of DA White Dwarf Binaries and Constraints on the Binary Population

  • Authors: Gautham Adamane Pallathadka, Vedant Chandra, Nadia L. Zakamska, Nicole R. Crumpler, Stefan M. Arseneau, Kareem El-Badry, Boris T. Gänsicke, Yossef Zenati, J.J. Hermes, Axel D. Schwope, Carles Badenes, Nicola Pietro Gentile Fusillo, Sean Morrison, Tim Cunningham, Priyanka Chakraborty, Gagik Tovmasian, Dmitry Bizyaev, Kaike Pan, Scott F. Anderson, Sebastian Demasi

Gautham Adamane Pallathadka et al 2026 The Astrophysical Journal 1002 .

  • Provider: AAS Journals

Caption: Figure 3.

The observed distribution of RV variability parameter η. The black dashed line shows the theoretical distribution expected as a result of statistical variation from observed RV errors alone, the gray area indicates our selection cutoff, and in black we show the observed distribution. Our sample shows larger RV variability than expected, indicating the presence of binaries. The error bars for the discrete counts are drawn using the approximation for Poisson error bar upper and lower limits given by ﹩0.5\pm \sqrt{n+0.25}﹩, where n is the number of counts in a given bin.

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