The Role of Luminosity Outbursts in The Evolution of Icy Mantles of Dust Grains in Protoplanetary Disks

The evolution and dynamics of icy mantles in protoplanetary disks are significantly influenced by luminosity outbursts of young stellar objects. This study investigates the role of such outbursts in reshaping the physical and chemical properties of dust aggregates and their ice mantles. Using a two-dimensional hydrodynamic model, we examine the interplay between the thermal effects of outbursts, dust coagulation and fragmentation, and the adsorptiondesorption cycles of key volatiles (H2O, CO2, CH4 and CO). Special attention is given to the temporal and spatial variations in the icy mantle composition and the conditions that drive the transition between pebble-forming aggregates and their disintegration into smaller particles. The results highlight the complex, non-axisymmetric response of disk structures to stellar outbursts and their critical role in shaping the volatile inventory available for planet formation.