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SUMMARY:An emerging new view on planet formation and protostellar accretio
 n - Sergei Nayakshin (Leicester)
DTSTART:20111010T150000Z
DTEND:20111010T160000Z
UID:TALK32522@talks.cam.ac.uk
CONTACT:Henrik Latter
DESCRIPTION:Theoretical studies of the last decade established that massiv
 e\nprotostellar/protoplanetary discs larger than about 50 AU\ngive birth t
 o massive (about 10 Jupiter mass) gas clumps. These clumps were\nthought t
 o contract into massive planets or brown dwarfs\, and perhaps explain a\nh
 andful of large separation giant exoplanets. However\,\nrecent numerical s
 imulations (by 5 independent groups so far) show that\nthese clumps migrat
 e inwards rapidly. Significantly\, the clumps may\nmigrate faster than the
 y contract\, thus getting tidally destroyed before\nthey make a WD or a gi
 ant planet. Tidal disruption remnants are not\nuninteresting -- these are 
 terrestrial-like planets and asteroids-like bodies.\nThis upgrade to the d
 isc instability model makes it potentially possible for\nthe model to prov
 ide an alternative (to core accretion) explanation for all\ntypes of exopl
 anets and the Solar System (Boley et al 2010\,\nNayakshin 2010).\nClearly\
 , quantitative and detailed modelling of these processes is required to\na
 ssess the true potential of the model.\nWe present some of the steps that 
 we have taken into this direction\, addressing\nFU Ori outbursts of protos
 tars\, "hot super earth" exoplanets\, and some of the\nstructure of the So
 lar System.\n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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