000K utf8 1100 2024$c2024-07-26 1500 eng 2050 urn:nbn:de:hbz:465-20250120-105659-3 2051 10.1093/mnras/stae1812 3000 Becker, Tim 3010 Onyeagusi, Florence Chioma 3010 Steinpilz, Tobias 3010 Teiser, Jens 3010 Völke, G. 3010 Wurm, Gerhard 4000 Tribocharged solids in protoplanetary discs$dinternal and external discharge time-scales [Becker, Tim] 4209 Particles regularly tribocharge in collisions. Here, we study how long charges can persist on such particles in the environment of a protoplanetary disc. We set up three complementary experiments to quantify discharge time-scales. We first directly measure the time dependency of charge on triboelectrically charged objects. For this aspect, we performed two long-time experiments under different environmental conditions. We find that the charge persists on the tribocharged bodies on time-scales between minutes and years. Discharge might be mediated by external ions or internally, by conduction. To constrain the latter, we also determined the specific electric resistance of dust samples as simulants for dust aggregates in protoplanetary discs. In this third experiment, we see an increase in resistivity at decreasing ambient pressure up to the limit of the instrument. These findings are consistent with the assumption that water on all relevant surfaces including dust grains within the pore space of aggregates is the main driver of discharge. Under disc conditions, the charge might persist for weeks to years. This leaves net-charged isolated grains in dense parts of the mid-plane of protoplanetary discs charged in between collisions. 4950 https://doi.org/10.1093/mnras/stae1812$xR$3Volltext$534 4950 https://nbn-resolving.org/urn:nbn:de:hbz:465-20250120-105659-3$xR$3Volltext$534 4961 https://duepublico2.uni-due.de/receive/duepublico_mods_00082351 5051 530 5550 protoplanetary discs