Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142 Marie Devinat, Émilie Habart, Éric Pantin, Nathalie Ysard, Anthony Jones, Lucas Labadie and Emmanuel Di Folco A&A, 663 (2022) A151 Published online: 28 July 2022 DOI: 10.1051/0004-6361/202243112