The spatial extent of polycyclic aromatic hydrocarbons emission in the Herbig star HD 179218 A. S. Taha, L. Labadie, E. Pantin, A. Matter, C. Alvarez, P. Esquej, R. Grellmann, R. Rebolo, C. Telesco and S. Wolf A&A, 612 (2018) A15 Published online: 13 April 2018 DOI: 10.1051/0004-6361/201732008