Physical and chemical fingerprint of protostellar disc formation E. Artur de la Villarmois, J. K. Jørgensen, L. E. Kristensen, E. A. Bergin, D. Harsono, N. Sakai, E. F. van Dishoeck and S. Yamamoto A&A, 626 (2019) A71 Published online: 14 June 2019 DOI: 10.1051/0004-6361/201834877