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SUMMARY:Planet formation in circumbinary systems - Gavin Coleman (QMUL)
DTSTART:20230117T130000Z
DTEND:20230117T140000Z
UID:TALK194872@talks.cam.ac.uk
CONTACT:Dr Emily Sandford
DESCRIPTION:In recent years numerous circumbinary planets have been discov
 ered- just exterior to the dynamical stability limit. The formation proces
 ses of such planets remains an unsolved problem. Forming planets close to 
 the stability limit has proven difficult to achieve due to large relative 
 velocities that result from interactions with the central binary stars. Re
 cent hydrodynamical simulations have shown that tidal torques from the cen
 tral binary act to form eccentric cavities within the circumbinary discs t
 ypically extending just past the stability limit with the sizes and proper
 ties of such cavities depending on both the binary and local disc properti
 es. One advantage of such eccentric cavities is that they act as barriers 
 to planet migration due to positive pressure gradients. In this presentati
 on I will present results on the evolution of circumbinary discs containin
 g dust species of varying size and abundance. The effects of the dust not 
 only on the disc but also on the implications for planet formation will be
  discussed. I will then present the results of Nbody simulations around ci
 rcumbinary stars such as Kepler-16 and Kepler-34. These simulations includ
 e the formation of planets through either pebble or planetesimal accretion
  within a 1D viscously evolving circumbinary disc. The circumbinary disc i
 ncludes 2D prescriptions for an eccentric precessing cavity based on resul
 ts from hydrodynamical simulations. We also include prescriptions for phot
 oevaporation planet migration and gas accretion. The results of such simul
 ations show that the pebble accretion scenarios are able to produce planet
 ary systems orbiting close to the central binary stars. In particular\, si
 mulations are able to produce planets akin to Kepler-16b and Kepler-34b. I
  will finally discuss formation scenarios for BEBOP-1 including planetesim
 al and embryo formation\, within a wide parameter space. The results of th
 ese simulations are able to give hints on the physical properties within c
 ircumbinary and protoplanetary discs.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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