Molecular remnant of Nova 1670 (CK Vulpeculae) - I. Properties and enigmatic origin of the gas Tomek Kamiński, Karl M. Menten, Romuald Tylenda, Ka Tat Wong, Arnaud Belloche, Andrea Mehner, Mirek R. Schmidt and Nimesh A. Patel A&A, 644 (2020) A59 Published online: 01 December 2020 DOI: 10.1051/0004-6361/202038648