Outflowing Gas in the Planetary Nebula K 3-54

Abstract As planetary nebulae evolve, they develop slow and strong dust-driven stellar winds, making the joint study of dust and gas essential for understanding their nature. As a pilot investigation, we selected planetary nebula (PN) K 3-54 as our target, the only known PN in the Milky Way to exhibit infrared emission from both graphene (C 24 ) and fullerene (C 60 ). The gas is traced via molecular line emissions from 12 CO, 13 CO, and C 18 O ( J = 1 → 0), observed using the 13.7 m telescope of the Purple Mountain Observatory. We investigate the dynamics of this PN and identify a bipolar outflow. Preliminary results suggest that the large dynamical timescale of the outflow and the weak shock environment may account for the simultaneous survival of C 24 and C 60 within and around PN K 3-54.