CO2 as the main parent source of atomic oxygen in comet C/2017 K2 (Pan-STARRS) P. Cambianica, G. Munaretto, G. Cremonese, L. Podio, C. Codella and W. Boschin A&A, 674 (2023) L14 Published online: 27 June 2023 DOI: 10.1051/0004-6361/202245550