Talk Title: Challenges in computational planet formation; from disk instability to\u00a0planetesimal formation.<\/b><\/p>\n
Abstract: I will discuss recent progress in modeling a number of important regimes in planet formation.\u00a0 First I will report on recent developments in the disk instability model for giant planet formation,\u00a0which is attractive to explain extrasolar gas giants on wide orbits.\u00a0I will show how new Lagrangian\u00a0hydrodynamical techniques can solve the long standing issue of non-convergence of the critical cooling for disk fragmentation. The same hydro method allows to study\u00a0the combination of self-gravity and MHD turbulence in disks, offering the intriguing possibility that angular momentum dissipation by MRI may promote gravitational instability.\u00a0I will then discuss planetesimal formation scenarios, introducing a new drag-vorticity instability whereby vortices in disks can generate long-lived, large enhancements of dust density which could be the precursors of planetesimals. This scenario\u00a0is alternative to the conventional streaming instability\u00a0and can take place starting from a wider range of initial properties of the dust layer. Finally, with the help of a novel sub-grid model for the\u00a0coagulation and fragmentation of dust grains implemented in our multi-fluid code, we show how the common practice of simulating only single grain sizes can lead to incorrect results for the transport of dust through the disk.<\/p>\n
Talk Title: Challenges in computational planet formation; from disk instability to\u00a0planetesimal formation. Abstract: I will discuss recent progress in modeling a number of important regimes in planet formation.\u00a0 First I will report on recent developments in the disk instability model for giant planet formation,\u00a0which is attractive to explain extrasolar gas giants on wide orbits.\u00a0I will … <\/p>\n