Joshua C. Dolence
Los Alamos National Laboratory
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Publication
Featured researches published by Joshua C. Dolence.
Space Science Reviews | 2018
Adam Burrows; David Vartanyan; Joshua C. Dolence; M. A. Skinner; D. Radice
We explore with self-consistent 2D Fornax simulations the dependence of the outcome of collapse on many-body corrections to neutrino-nucleon cross sections, the nucleon-nucleon bremsstrahlung rate, electron capture on heavy nuclei, pre-collapse seed perturbations, and inelastic neutrino-electron and neutrino-nucleon scattering. Importantly, proximity to criticality amplifies the role of even small changes in the neutrino-matter couplings, and such changes can together add to produce outsized effects. When close to the critical condition the cumulative result of a few small effects (including seeds) that individually have only modest consequence can convert an anemic into a robust explosion, or even a dud into a blast. Such sensitivity is not seen in one dimension and may explain the apparent heterogeneity in the outcomes of detailed simulations performed internationally. A natural conclusion is that the different groups collectively are closer to a realistic understanding of the mechanism of core-collapse supernovae than might have seemed apparent.
The Astrophysical Journal | 2015
Benjamin R. Ryan; Joshua C. Dolence; Charles F. Gammie
We present bhlight, a numerical scheme for solving the equations of general relativistic radiation magnetohydrodynamics using a direct Monte Carlo solution of the frequency-dependent radiative transport equation. bhlight is designed to evolve black hole accretion flows at intermediate accretion rate, in the regime between the classical radiatively efficient disk and the radiatively inefficient accretion flow (RIAF), in which global radiative effects play a sub-dominant but non-negligible role in disk dynamics. We describe the governing equations, numerical method, idiosyncrasies of our implementation, and a suite of test and convergence results. We also describe example applications to radiative Bondi accretion and to a slowly accreting Kerr black hole in axisymmetry.
The Astrophysical Journal | 2016
M. Aaron Skinner; Adam Burrows; Joshua C. Dolence
We perform the first self-consistent, time-dependent, multi-group calculations in two dimensions (2D) to address the consequences of using the ray-by-ray+ transport simplification in core-collapse supernova simulations. Such a dimensional reduction is employed by many researchers to facilitate their resource-intensive calculations. Our new code (F{sc{ornax}}) implements multi-D transport, and can, by zeroing out transverse flux terms, emulate the ray-by-ray+ scheme. Using the same microphysics, initial models, resolution, and code, we compare the results of simulating 12-, 15-, 20-, and 25-M
The Astrophysical Journal | 2017
David Radice; Adam Burrows; David Vartanyan; M. Aaron Skinner; Joshua C. Dolence
_{odot}
The Astrophysical Journal | 2017
Jeremiah W. Murphy; Joshua C. Dolence
progenitor models using these two transport methods. Our findings call into question the wisdom of the pervasive use of the ray-by-ray+ approach. Employing it leads to maximum post-bounce/pre-explosion shock radii that are almost universally larger by tens of kilometers than those derived using the more accurate scheme, typically leaving the post-bounce matter less bound and artificially more explodable. In fact, for our 25-M
The Astrophysical Journal | 2016
Adam Burrows; Joshua C. Dolence
_{odot}
The Astrophysical Journal | 2017
Benjamin R. Ryan; Sean M. Ressler; Joshua C. Dolence; Alexander Tchekhovskoy; Charles F. Gammie; Eliot Quataert
progenitor, the ray-by-ray+ model explodes, while the corresponding multi-D transport model does not. Therefore, in two dimensions the combination of ray-by-ray+ with the axial sloshing hydrodynamics that is a feature of 2D supernova dynamics can result in quantitatively, and perhaps qualitatively, incorrect results.
The Astrophysical Journal | 2017
Sherwood Richers; Hiroki Nagakura; Christian D. Ott; Joshua C. Dolence; Kohsuke Sumiyoshi; Shoichi Yamada
We present new 1D (spherical) and 2D (axisymmetric) simulations of electron-capture (EC) and low-mass iron-core-collapse supernovae (SN). We consider six progenitor models: the ECSN progenitor from Nomoto (1984, 1987); two ECSN-like low-mass low-metallicity iron core progenitors from Heger (private communication); and the 9-, 10-, and 11-
Monthly Notices of the Royal Astronomical Society | 2016
Nicole M. Lloyd-Ronning; Joshua C. Dolence; Christopher L. Fryer
M_odot
Monthly Notices of the Royal Astronomical Society | 2018
David Vartanyan; Adam Burrows; David Radice; M. Aaron Skinner; Joshua C. Dolence
(zero-age main sequence) progenitors from Sukhbold et al. (2016). We confirm that the ECSN and ESCN-like progenitors explode easily even in 1D with explosion energies of up to a 0.15 Bethes (