Gaia Data Release 3 - Astrometric binary star processing Jean-Louis Halbwachs, Dimitri Pourbaix, Frédéric Arenou, Laurent Galluccio, Patrick Guillout, Nathalie Bauchet, Olivier Marchal, Gilles Sadowski and David Teyssier A&A, 674 (2023) A9 Published online: 16 June 2023 DOI: 10.1051/0004-6361/202243969