Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data

Understand

We report the discovery of a candidate binary system consisting of a black hole (BH) and a red giant branch star from the Gaia DR3.

• This binary system is discovered from 64108 binary solutions for which both astrometric and spectroscopic data are available.
• For this system, the astrometric and spectroscopic solutions are consistent with each other, making this system a confident candidate of a BH binary.
• The primary (visible) star in this system, Gaia DR3 5870569352746779008, is a red giant branch whose mass is quite uncertain.