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Mass Ejection by Strange Star Mergers and Observational Implications
A. Bauswein, H. -Th. Janka, R. Oechslin +5
We determine the Galactic production rate of strangelets as a canonical input to calculations of the measurable cosmic ray flux of strangelets by performing simulations of strange…
Influence of light nuclei on neutrino-driven supernova outflows
A. Arcones, G. Martinez-Pinedo, E. O'Connor +4
We study the composition of the outer layers of a protoneutron star and show that light nuclei are present in substantial amounts. The composition is dominated by nucleons, deutero…
r-Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole - Neutron Star Mergers
R. Surman, G. C. McLaughlin, M. Ruffert +2
We consider hot accretion disk outflows from black hole - neutron star mergers in the context of the nucleosynthesis they produce. We begin with a three dimensional numerical model…
Supernova explosions and the birth of neutron stars
H. -Th. Janka, A. Marek, B. Mueller +1
We report here on recent progress in understanding the birth conditions of neutron stars and the way how supernovae explode. More sophisticated numerical models have led to the dis…
Dynamics of shock propagation and nucleosynthesis conditions in O-Ne-Mg core supernovae
H. -Th. Janka, B. Mueller, F. S. Kitaura +1
It has been recently proposed that the shocked surface layers of exploding O-Ne-Mg cores provide the conditions for r-process nucleosynthesis, because their rapid expansion and hig…
Neutrino oscillation signatures of oxygen-neon-magnesium supernovae
C. Lunardini, B. Mueller, H. -Th. Janka
We discuss the flavor conversion of neutrinos from core collapse supernovae that have oxygen-neon-magnesium (ONeMg) cores. Using the numerically calculated evolution of the star up…
Delayed neutrino-driven supernova explosions aided by the standing accretion-shock instability
A. Marek, H. Th. Janka
We present results of 2D hydrodynamic simulations of stellar core collapse, which confirm that the neutrino-heating mechanism remains viable for the explosion of a wider mass range…
Neutrino-driven explosions twenty years after SN1987A
H. -Th. Janka, A. Marek, F. -S. Kitaura
The neutrino-heating mechanism remains a viable possibility for the cause of the explosion in a wide mass range of supernova progenitors. This is demonstrated by recent two-dimensi…
Effects of Inelastic Neutrino-Nucleus Scattering on Supernova Dynamics and Radiated Neutrino Spectra
K. Langanke, G. Martinez-Pinedo, B. Mueller +5
Based on the shell model for Gamow-Teller and the Random Phase Approximation for forbidden transitions, we have calculated reaction rates for inelastic neutrino-nucleus scattering…
Multidimensional supernova simulations with approximative neutrino transport. II. Convection and the advective-acoustic cycle in the supernova core
L. Scheck, H. -Th. Janka, T. Foglizzo +1
By 2D hydrodynamic simulations including a detailed equation of state and neutrino transport, we investigate the interplay between different non-radial hydrodynamic instabilities t…
Gravitational waves from relativistic neutron star mergers with nonzero-temperature equations of state
R. Oechslin, H. -T. Janka
We analyze the gravitational wave (GW) emission from our recently published set of relativistic neutron star (NS) merger simulations and determine characteristic signal features th…
Theory of Core-Collapse Supernovae
H. -Th. Janka, K. Langanke, A. Marek +2
Advances in our understanding and the modeling of stellar core-collapse and supernova explosions over the past 15 years are reviewed, concentrating on the evolution of hydrodynamic…
Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. I. Spherically symmetric hydrodynamic simulations
A. Arcones, H. -Th. Janka, L. Scheck
We investigate the behavior and consequences of the reverse shock that terminates the supersonic expansion of the baryonic wind which is driven by neutrino heating off the surface…
Relativistic neutron star merger simulations with non-zero temperature equations of state I. Variation of binary parameters and equation of state
R. Oechslin, H. -T. Janka, A. Marek
An extended set of binary neutron star (NS) merger simulations is performed with an approximative conformally flat treatment of general relativity to systematically investigate the…
Nucleosynthesis in neutrino heated matter: The vp-process and the r-process
G. Martínez-Pinedo, A. Kelic, K. Langanke +11
This manuscript reviews recent progress in our understanding of the nucleosynthesis of medium and heavy elements in supernovae. Recent hydrodynamical models of core-collapse supern…
Neutrino pair annihilation near accreting, stellar-mass black holes
R. Birkl, M. -A. Aloy, H. -Th. Janka +1
We investigate the energy-momentum deposition due to neutrino-antineutrino annihilation in the vicinity of axisymmetric, accreting black holes (BHs) by numerically ray-tracing neut…
Instability of a stalled accretion shock: evidence for the advective-acoustic cycle
T. Foglizzo, P. Galletti, L. Scheck +1
We analyze the linear stability of a stalled accretion shock in a perfect gas with a parametrized cooling function L ~ rho^{beta-alpha} P^alpha. The instability is dominated by the…
Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae
F. S. Kitaura, H. -Th. Janka, W. Hillebrandt
We present results of simulations of stellar collapse and explosions in spherical symmetry for progenitor stars in the 8-10 solar mass range with an O-Ne-Mg core. The simulations w…
Multidimensional Supernova Simulations with Approximative Neutrino Transport I. Neutron Star Kicks and the Anisotropy of Neutrino-Driven Explosions in Two Spatial Dimensions
L. Scheck, K. Kifonidis, H. -Th. Janka +1
By means of two-dimensional (2D) simulations we study hydrodynamic instabilities during the first seconds of neutrino-driven supernova explosions, using a PPM hydrodynamics code, s…
Two-Dimensional Hydrodynamic Core-Collapse Supernova Simulations with Spectral Neutrino Transport II. Models for Different Progenitor Stars
R. Buras, H. -Th. Janka, M. Rampp +1
1D and 2D supernova simulations for stars between 11 and 25 solar masses are presented, making use of the Prometheus/Vertex neutrino-hydrodynamics code, which employs a full spectr…
Non-Spherical Core-Collapse Supernovae II. Late-Time Evolution of Globally Anisotropic Neutrino-Driven Explosions and Implications for SN 1987A
K. Kifonidis, T. Plewa, L. Scheck +2
Two-dimensional simulations of strongly anisotropic supernova explosions of a nonrotating 15 solar mass blue supergiant progenitor are presented, which follow the hydrodynamic evol…
Off-Axis Properties of Short Gamma-Ray Bursts
H. -Th. Janka, M. -A. Aloy, P. A. Mazzali +1
Based on recent models of relativistic jet formation by thermal energy deposition around black hole-torus systems, the relation between the on- and off-axis appearance of short, ha…
Neutrino-driven convection versus advection in core collapse supernovae
T. Foglizzo, L. Scheck, H. -Th. Janka
A toy model is analyzed in order to evaluate the linear stability of the gain region immediately behind a stalled accretion shock, after core bounce. This model demonstrates that a…
Two-dimensional hydrodynamic core-collapse supernova simulations with spectral neutrino transport. I. Numerical method and results for a 15 M_sun star
R. Buras, M. Rampp, H. -Th. Janka +1
Supernova models with a full spectral treatment of the neutrino transport are presented, employing the Prometheus/Vertex neutrino-hydrodynamics code with a ``ray-by-ray plus'' appr…