Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks: The 6.2/7.7 and 11.3/7.7 Band Ratios as a Diagnostic Tool Seok, Ji Yeon ; Li, Aigen Abstract Publication: IAU General Assembly Pub Date: March 2020 DOI: 10.1017/S1743921319004976 Bibcode: 2020IAUGA..30..408S