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SUMMARY:Inward (or outward?) migration of massive planets in protoplanetar
 y discs - Chiara Scardoni\, Università degli Studi di Milano
DTSTART:20250528T121500Z
DTEND:20250528T124000Z
UID:TALK232741@talks.cam.ac.uk
CONTACT:Cristiano Longarini
DESCRIPTION:According to the classical picture\, type II migration is a sl
 ow\, inward motion of the planet that either follows the disc viscous evol
 ution (disc-dominated regime) or is much slower than that (planet-dominate
 d regime). However\, over the last decade\, this picture of type II migrat
 ion has significantly evolved\, suggesting faster migration in the disc-do
 minated regime and even outward migration in the planet-dominated regime. 
 In this talk\, I will present recent results exploring the planet-dominate
 d regime via live-planet\, long-term simulations of planet migration. Thes
 e show the existence of a correlation between the “gap-depth parameter
 ” K and the direction of planet migration: planets migrate outward or in
 ward depending on whether K is above or below a critical threshold Klim. T
 his also implies the existence of “stalling radius” where migration ha
 lts. Using these results\, I will introduce a toy model that allows to pre
 dict that massive planets accumulate in a band near the stalling radius (t
 ypically between 1–10 au)\, offering an explanation for the observed dis
 tribution of Jupiter-like exoplanets while challenging classical models of
  hot Jupiter formation.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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