A hidden population of white dwarfs with atmospheric carbon traces in the Gaia bifurcation Maria Camisassa, Santiago Torres, Mark Hollands, Detlev Koester, Roberto Raddi, Leandro G. Althaus and Alberto Rebassa-Mansergas A&A, 674 (2023) A213 Published online: 23 June 2023 DOI: 10.1051/0004-6361/202346628