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- W808522823 abstract "The Gravitational Instability and its Role in the Evolution of Protoplanetary and Protostellar Discs Peter J Cossins MMath (Exon) In this thesis I present numerical simulations of massive, cold, non-ionised selfgravitating accretion discs about a central massive object, and then use them to investigate structure formation and energy/angular momentum transport, the effects of different cooling regimes on the likelihood of bound condensates forming through direct gravitational fragmentation, and the potential for resolved sub-mm imaging of such systems. I also present a review of current theories of viscous and wave transport in astrophysical discs, observed properties of protostellar and protoplanetary discs and a numerical scheme suitable for conducting computational experiments on fluid discs. I find that the structures excited in self-gravitating fluid discs self-regulate in such a manner that the density waves formed are very weak shocks, with the amplitude of the density perturbations forming the waves determined by the cooling regime. This self-regulation process ensures that for discs of . 10% of the central object mass the transport properties are determined principally by local effects, representing a crucial difference between collisional (fluid) and collisionless (stellar) discs as the latter cannot form shocks. I further find that the effects of an opacity-based cooling function makes selfgravitating protoplanetary discs significantly more susceptible to fragment formation in certain opacity regimes at relatively high (10 − 10 M⊙ yr) accretion rates due to the dependence on temperature perturbations. Furthermore I find that fragment formation due to direct gravitational collapse is feasible in such discs only at radii & 50 AU, and this radius increases with decreasing temperature if the background temperature falls below approximately 10K. Finally I have used simple disc models in conjuction with a realistic telescope model to demonstrate that resolved images of spiral structure in massive, selfgravitating protostellar discs should be readily observable with ALMA, out to distances representative of local star-forming complexes." @default.
- W808522823 created "2016-06-24" @default.
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- W808522823 date "2010-10-01" @default.
- W808522823 modified "2023-10-16" @default.
- W808522823 title "The Gravitational Instability and its Role in the Evolution of Protoplanetary and Protostellar Discs" @default.
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