Two-Dimensional Multiangle, Multigroup Neutrino Radiation-Hydrodynamic Simulations of Postbounce Supernova Cores

By Christian D. Ott, Adam Burrows, L. Dessart, E. Livne. 2008

169 citations recorded by the source corpus.

We perform axisymmetric (2D) multiangle, multigroup neutrino radiation-hydrodynamic calculations of the postbounce phase of core-collapse supernovae using a genuinely 2D discrete-ordinate (Sn) method. We follow the long-term postbounce evolution of the cores of one nonrotating and one rapidly rotating 20 M☉ stellar model for ~400 milliseconds from 160 to ~550 ms after bounce. We present a multidimensional analysis of the multiangle neutrino radiation fields and compare in detail with counterpart simulations carried out in the 2D multigroup flux-limited diffusion (MGFLD) approximation to neutrino transport. We find that 2D multiangle transport is superior in capturing the global and local radiation-field variations associated with rotation-induced and SASI-induced aspherical hydrodynamic configurations. In the rotating model, multiangle transport predicts much larger asymptotic neutrino flux asymmetries with pole-to-equator ratios of up to ~2.5, while MGFLD tends to sphericize the radiation fields already in the optically semitransparent postshock regions. Along the poles, the multiangle calculation predicts a dramatic enhancement of the neutrino heating by up to a factor of 3, which alters the postbounce evolution and results in greater polar shock radii and an earlier onset of the initially rotationally weakened SASI. In the nonrotating model, differences between multiangle and MGFLD calculations remain small at early times when the postshock region does not depart significantly from spherical symmetry. At later times, however, the growing SASI leads to large-scale asymmetries and the multiangle calculation predicts up to 30% higher average integral neutrino energy deposition rates than MGFLD.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/64b9471f82fc1a01d4eb9befd9c5d47d5199ff23

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Citations in the corpus

Equation-of-state dependent features in shock-oscillation modulated neutrino and gravitational-wave signals from supernovae (2008, background): “Recent multi-angle simulations in twodimensional situations (Ott et al. 2008) – though done at the expense of a sophisticated description of the energy dependence – show that a detailed angular treatment produces considerably less lateral smearing of the outward directed radiation field than…”
Global comparison of core-collapse supernova simulations in spherical symmetry (2018, methodology): “There have also been comparisons, both in 1D [8] and 2D [9], where the focus was placed on comparing static postbounce snapshots of multi-group fluxlimited diffusion simulations with the solutions from Boltzmann neutrino transport solvers.”
THREE-DIMENSIONAL HYDRODYNAMIC CORE-COLLAPSE SUPERNOVA SIMULATIONS FOR AN 11.2 M☉ STAR WITH SPECTRAL NEUTRINO TRANSPORT (2011, background): “Although it would be highly computationally expensive, the full-angle transport will give us the correct answer (e.g., Ott et al. (2008); Brandt et al. (2011)).”
DIMENSION AS A KEY TO THE NEUTRINO MECHANISM OF CORE-COLLAPSE SUPERNOVA EXPLOSIONS (2010, methodology): “Interestingly, using a multiangle variant of VULCAN, Ott et al. (2008) have shown that for non-rotating models the results for the multiangle and MGFLD simulations are similar.”
Colloquium: Perspectives on core-collapse supernova theory (2012, background): “Ott et al. (2008), performing the only multi-group, multi-angle neutrino transport calculations ever done in 2D, have shown that the integral nature of transport smoothes out the radiation field much more than the matter fields.”
Criteria for Core-Collapse Supernova Explosions by the Neutrino Mechanism (2008, background): “Recently, Ott et al. (2008) compared MGFLD and multi-angle transport in VULCAN/2D.”
AN OPEN-SOURCE NEUTRINO RADIATION HYDRODYNAMICS CODE FOR CORE-COLLAPSE SUPERNOVAE (2014, methodology): “…of theoretical research on CCSN has revealed that an accurate treatment of neutrinos is an important and essential ingredient in modeling the CCSN central engine (Bethe & Wilson 1985; Janka et al. 2007; Ott et al. 2008; Müller et al. 2010) and the protoneutron star cooling phase (Roberts 2012).”
The Status of Multi-Dimensional Core-Collapse Supernova Models (2016, methodology): “On the other hand, fully multi-dimensional flux limited diffusion approaches smear out angular variations in the radiation field too strongly (Ott et al. 2008).”
A MODEL FOR GRAVITATIONAL WAVE EMISSION FROM NEUTRINO-DRIVEN CORE-COLLAPSE SUPERNOVAE (2009, methodology): “M⊙ progenitor model are much larger than simulations obtain that consistently calculate neutrino transport (Dessart et al.2006; Ott et al. 2008; Marek & Janka 2009).”
GENERAL-RELATIVISTIC SIMULATIONS OF THREE-DIMENSIONAL CORE-COLLAPSE SUPERNOVAE (2012, methodology): “…to larger average shock radii, increase the dwell time of material in the gain region, may lead to secondary shocks, and are thus generally aiding the explosion mechanism (Ohnishi et al. 2006; Scheck et al. 2006; Murphy & Burrows 2008; Ott et al. 2008; Marek & Janka 2009; B. Müller et al. 2012b).”
A NEW MULTI-DIMENSIONAL GENERAL RELATIVISTIC NEUTRINO HYDRODYNAMICS CODE OF CORE-COLLAPSE SUPERNOVAE. III. GRAVITATIONAL WAVE SIGNALS FROM SUPERNOVA EXPLOSION MODELS (2012, background): “The ray-by-ray-plus approach allows us to predict angular variations in the neutrino radiation field (and hence the low-frequency GW signal generated by the neutrinos) at least in rough qualitative agreement with full multi-angle transport (Ott et al. 2008; Brandt et al. 2011).”
BLACK HOLE FORMATION IN FAILING CORE-COLLAPSE SUPERNOVAE (2010, methodology): “Fryer & Heger (2000) 15 and Ott et al. (2008), who considered similarly rapidly rotating models, also see this effect.”
NEUTRINO SIGNATURES AND THE NEUTRINO-DRIVEN WIND IN BINARY NEUTRON STAR MERGERS (2008, methodology): “Including theϕ direction, a total number of 144 angles were treated, following the prescription described in Ott et al. (2008).”
A NEW MULTI-DIMENSIONAL GENERAL RELATIVISTIC NEUTRINO HYDRODYNAMIC CODE FOR CORE-COLLAPSE SUPERNOVAE. I. METHOD AND CODE TESTS IN SPHERICAL SYMMETRY (2010, background): “Still, simulations with ray-by-ray transport show effects that are qualitatively similar to those seen by Ott et al. (2008) with multi-angle transport.”