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SUMMARY:Coorbital trapping by persistent gaseous vortices: A possible way 
 to form Cold Kuiper-Belt planetesimals - Pierre Barge
DTSTART:20221031T140000Z
DTEND:20221031T150000Z
UID:TALK186344@talks.cam.ac.uk
CONTACT:Zhao Guo
DESCRIPTION:Large-scale vortices in protoplanetary disks are expected to f
 orm and survive for long periods of time in\naccordance with disk asymmetr
 ies observed in the sub-mm and mm wavelength ranges. Such vortices are kno
 wn to trap\nin their core large amounts of dust grains that we assume to a
 gglomerate into big boulders weakly coupled to the gas.\nAims. The dynamic
 s and growth of the boulders is explored when the vortex is located at 50A
 U from the star\, a region\nof the disk where self-gravity plays a signifi
 cant role.\nMethods. Global 2D simulations are used to follow boulder dyna
 mics in the star+disk gravitational field. Collisional\nevolution of the b
 oulders is discussed and traced on the standard coagulation scenario.\nRes
 ults. When released by the core\, the boulders accumulate in the co-orbita
 l region associated to the vortex where they\nstay confined in a domain th
 at shrinks radially due to gas drag. The increased density and the low vel
 ocity-dispersion\nfavour the coagulation of the boulders that reach the ki
 lometer-size range in some thousands orbital periods. After the\nvortex de
 ath\, the evolution continues following the standard scenario.\nConclusion
 s. Besides their ability to capture and accumulate dust-grains in their co
 re large-scale vortices can also\nconfine boulder-size particles in their 
 co-orbital region. Trapped boulders can grow into km-size planetesimals po
 ssibly\nexplaining the formation of Cold Classical Kuiper-Belt Objects (CC
 -KBOs)   
LOCATION:In Person MR14 + Online
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