Volatile-carbon locking and release in protoplanetary disks - A study of TW Hya and HD 100546 M. Kama, S. Bruderer, E. F. van Dishoeck, M. Hogerheijde, C. P. Folsom, A. Miotello, D. Fedele, A. Belloche, R. Güsten and F. Wyrowski A&A, 592 (2016) A83 Published online: 02 August 2016 DOI: 10.1051/0004-6361/201526991