A5090871406- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Heat Transfer Mechanisms
- Stellar, planetary, and galactic studies
- Fluid Dynamics Simulations and Interactions
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Lattice Boltzmann Simulation Studies
- Advanced Combustion Engine Technologies
- Experimental and Theoretical Physics Studies
- Galaxies: Formation, Evolution, Phenomena
- Fluid Dynamics and Heat Transfer
- Mechanics and Biomechanics Studies
Monash University
2016-2021
We present Phantom, a fast, parallel, modular and low-memory smoothed particle hydrodynamics magnetohydrodynamics code developed over the last decade for astrophysical applications in three dimensions. The has been with focus on stellar, galactic, planetary high energy astrophysics already used widely studies of accretion discs turbulence, from birth planets to how black holes accrete. Here we describe test core algorithms as well modules magnetohydrodynamics, self-gravity, sink particles,...
We present a new approach to understand the landscape of supernova explosion energies, ejected nickel masses, and neutron star birth masses. In contrast other recent parametric approaches, our model predicts properties neutrino-driven explosions based on pre-collapse stellar structure without need for hydrodynamic simulations. The is physically motivated scaling laws simple differential equations describing shock propagation, contraction star, neutrino emission, heating conditions,...
Abstract Stars falling too close to massive black holes in the centers of galaxies can be torn apart by strong tidal forces. Simulating subsequent feeding hole with disrupted material has proved challenging because range timescales involved. Here we report a set simulations that capture relativistic disruption star, followed 1 yr evolution returning debris stream. These reveal formation an expanding asymmetric bubble extending hundreds au—an outflowing Eddington envelope optically thick...
We test the hypothesis that initial mass function (IMF) is determined by density probability distribution (PDF) produced supersonic turbulence. compare 14 simulations of star cluster formation in 50 solar molecular cloud cores where turbulence contains either purely solenoidal or compressive modes, each case resolving fragmentation to opacity limit determine resultant IMF. find statistically indistinguishable IMFs between two sets calculations, despite a factor difference rate and standard...
Of the 21 known gaseous debris discs around white dwarfs, a large fraction of them display observational features that are well described by an eccentric distribution gas. In absence embedded objects or additional forces, these should not remain for long timescales, and instead circularise due to viscous spreading. The metal pollution infrared excess we observe from stars is consistent with presence tidally disrupted sub-stellar bodies. We demonstrate, using smoothed particle hydrodynamics,...
We present a method for general relativistic smoothed particle hydrodynamics (GRSPH), based on an entropy-conservative form of the hydrodynamic equations perfect fluid. aim to replace approximate treatments relativity in current SPH simulations tidal disruption events and accretion discs. develop improved shock capturing formulation that distinguishes between viscosity conductivity relativity. also describe new Hamiltonian time integration algorithm orbital dynamics GRSPH. Our correctly...
We perform 3D general relativistic smoothed particle hydrodynamics (GRSPH) simulations of tidal disruption events involving 1 $M_\odot$ stars and $10^6 M_\odot$ rotating supermassive black holes. consider on initially elliptical orbits both in, inclined to, the hole equatorial plane. confirm that stream-stream collisions caused by apsidal precession rapidly circularise disrupted material into a disc. For trajectories we find nodal induced spin (i.e. Lense-Thirring precession) inhibits only...
We present an online, open and comprehensive template library of gravitational waveforms produced during the tidal disruptions stars by massive black holes, spanning a broad space parameters. build this thanks to new feature that we implement in general relativistic version PHANTOM, smoothed particle hydrodynamics code for three dimensional simulations relativity. first perform series numerical tests show wave (GW) signal obtained is excellent agreement with one expected from theory. This...
Stars falling too close to massive black holes in the centres of galaxies can be torn apart by strong tidal forces. Simulating subsequent feeding hole with disrupted material has proved challenging because range timescales involved. Here we report a set simulations that capture relativistic disruption star, followed one year evolution returning debris stream. These reveal formation an expanding asymmetric bubble extending hundreds astronomical units -- Eddington envelope optically thick...