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SUMMARY:Murdin Prize Ceremony -- Inward and outward migration of massive p
 lanets: moving towards a stalling radius - Chiara Scardoni
DTSTART:20230125T131500Z
DTEND:20230125T133000Z
UID:TALK196309@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Recent studies on the planet-dominated regime of Type II migra
 tion showed that massive planets can migrate outwards. Using 'fixed-planet
 ' simulations\, these studies found a correlation between the sign of the 
 torques acting on the planet (thus the direction of migration) and the par
 ameter K' (which describes the depth of the gap carved by the planet in th
 e disc). We perform 'live-planet' simulations exploring a range of K' and 
 disc mass values to test and extend these results. The excitation of plane
 t eccentricity in live-planet simulations breaks the direct dependence of 
 migration rate on the torques imposed. By considering only the contributio
 n to the torque due to the semimajor axis\, we recover the relation betwee
 n the direction of migration and K'. We then present a toy model in which 
 the sign of planetary migration changes at a limiting value of K\, through
  which we explore planets' migration in viscously evolving discs. The exis
 tence of the torque reversal shapes the planetary system's architecture by
  accumulating planets around a stalling radius\, suggesting that planets p
 ile up in the area 1-10 au\, and thus disfavouring hot Jupiter formation t
 hrough Type II migration in the planet-dominated regime.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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