Disc fragmentation and oligarchic growth of protostellar systems in low-metallicity gas clouds

  title={Disc fragmentation and oligarchic growth of protostellar systems in low-metallicity gas clouds},
  author={Gen Chiaki and Naoki Yoshida},
  journal={Monthly Notices of the Royal Astronomical Society},
  • G. Chiaki, N. Yoshida
  • Published 13 August 2020
  • Physics
  • Monthly Notices of the Royal Astronomical Society
We study low-metallicity star formation with a set of high-resolution hydrodynamics simulations for various gas metallicities over a wide range 0–$10^{-3} \ {\rm Z_{\bigodot }}$. Our simulations follow non-equilibrium chemistry and radiative cooling by adopting realistic elemental abundance and dust size distribution. We examine the condition for the fragmentation of collapsing clouds (cloud fragmentation; CF) and of accretion discs (disc fragmentation; DF). We find that CF is suppressed due… Expand
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Progress of Theoretical
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Projection of density in the accretion discs for (a) HAZ-6 and (b) HAZ-5, where tidal disruption events (TDEs) occur
  • MNRAS 000,
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They perform a detailed analysis of the time evolution of spiral arms using an analytic model and direct simulations to define the conditions for fragmentation
  • 2020
2016) suggest that fragmentation along spiral arms in an accretion disc occurs with Q < 0.6. The lower panels of Fig. A3 show that Q is marginally small, Q ' 0.6, on ARM1 and ARM2
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Protostars forming through the break-up show interest
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Protostars in our simulations
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Although multiple protostars form along the filament and collide with PS1, these secondary protostars have small masses