313 citations · 4.8k across the 55 of their papers we have counts for
55 papers
Constraining properties of high-density matter in neutron stars with magneto-elastic oscillations
Michael Gabler, Pablo Cerdá-Durán, Nikolaos Stergioulas +2
We discuss torsional oscillations of highly magnetised neutron stars (magnetars) using two-dimensional, magneto-elastic-hydrodynamical simulations. Our model is able to explain bot…
Intermediate-Mass-Elements in Young Supernova Remnants Reveal Neutron Star Kicks by Asymmetric Explosions
Satoru Katsuda, Mikio Morii, Hans-Thomas Janka +9
The birth properties of neutron stars yield important information on the still debated physical processes that trigger the explosion and on intrinsic neutron-star physics. These pr…
On the measurements of numerical viscosity and resistivity in Eulerian MHD codes
Tomasz Rembiasz, Martin Obergaulinger, Pablo Cerdá-Durán +2
We propose a simple ansatz for estimating the value of the numerical resistivity and the numerical viscosity of any Eulerian MHD code. We test this ansatz with the help of simulati…
Production and Distribution of Ti and Ni in a Three-dimensional Supernova Model Resembling Cassiopeia A
A. Wongwathanarat, H. -Th. Janka, E. Mueller +2
The spatial and velocity distributions of nuclear species synthesized in the innermost regions of core-collapse supernovae can yield important clues about explosion asymmetries and…
Magnetic Field Amplification During the Common Envelope Phase
Sebastian T. Ohlmann, Friedrich K. Roepke, Ruediger Pakmor +2
During the common envelope (CE) phase, a giant star in a binary system overflows its Roche lobe and unstable mass transfer leads to a spiral-in of the companion, resulting in a clo…
APSARA: A multi-dimensional unsplit fourth-order explicit Eulerian hydrodynamics code for arbitrary curvilinear grids
Annop Wongwathanarat, Hannes Grimm-Strele, Ewald Müller
We present a new fourth-order, finite-volume hydrodynamics code named Apsara. The code employs a high-order, finite-volume method for mapped coordinates with extensions for nonline…
Parametric initial conditions for core-collapse supernova simulations
Yudai Suwa, Ewald Müller
We investigate a method to construct parametrized progenitor models for core-collapse supernova simulations. Different from all modern core-collapse supernova studies, which rely o…
Dynamic system classifier
Daniel Pumpe, Maksim Greiner, Ewald Müller +1
Stochastic differential equations describe well many physical, biological and sociological systems, despite the simplification often made in their derivation. Here the usage of sim…
Termination of the magnetorotational instability via parasitic instabilities in core-collapse supernovae
Tomasz Rembiasz, Martin Obergaulinger, Pablo Cerdá-Durán +2
The magnetorotational instability (MRI) can be a powerful mechanism amplifying the magnetic field in core-collapse supernovae. Whether initially weak magnetic fields can be amplifi…
Numerical simulations of the magnetorotational instability in protoneutron stars: I. Influence of buoyancy
Jerome Guilet, Ewald Mueller
The magneto-rotational instability (MRI) is considered to be a promising mechanism to amplify the magnetic field in fast rotating protoneutron stars. In contrast to accretion disks…
Numerical Relativity in Spherical Polar Coordinates: Off-center Simulations
Thomas W. Baumgarte, Pedro J. Montero, Ewald Müller
We have recently presented a new approach for numerical relativity simulations in spherical polar coordinates, both for vacuum and for relativistic hydrodynamics. Our approach is b…
Neutrino viscosity and drag: impact on the magnetorotational instability in protoneutron stars
Jerome Guilet, Ewald Mueller, Hans-Thomas Janka
The magnetorotational instability (MRI) is a promising mechanism to amplify the magnetic field in fast rotating protoneutron stars. The diffusion of neutrinos trapped in the PNS in…
Three-Dimensional Simulations of Core-Collapse Supernovae: From Shock Revival to Shock Breakout
Annop Wongwathanarat, Ewald Mueller, H. -Thomas Janka
We present 3D simulations of core-collapse supernovae from blast-wave initiation by the neutrino-driven mechanism to shock breakout from the stellar surface, considering two 15 Msu…
Modulating the magnetosphere of magnetars by internal magneto-elastic oscillations
Michael Gabler, Pablo Cerdá-Durán, Nikolaos Stergioulas +2
We couple internal torsional, magneto-elastic oscillations of highly magnetized neutron stars (magnetars) to their magnetospheres. The corresponding axisymmetric perturbations of t…
Fully covariant and conformal formulation of the Z4 system in a reference-metric approach: comparison with the BSSN formulation in spherical symmetry
Nicolas Sanchis-Gual, Pedro J. Montero, Jose A. Font +2
We adopt a reference-metric approach to generalize a covariant and conformal version of the Z4 system of the Einstein equations. We refer to the resulting system as ``fully covaria…
Collapse of Nonlinear Gravitational Waves in Moving-Puncture Coordinates
David Hilditch, Thomas W. Baumgarte, Andreas Weyhausen +4
We study numerical evolutions of nonlinear gravitational waves in moving-puncture coordinates. We adopt two different types of initial data -- Brill and Teukolsky waves -- and evol…
General relativistic hydrodynamics in curvilinear coordinates
Pedro J. Montero, Thomas W. Baumgarte, Ewald Müller
In this paper we report on what we believe is the first successful implementation of relativistic hydrodynamics, coupled to dynamical spacetimes, in spherical polar coordinates wit…
Imprints of superfluidity on magneto-elastic QPOs of SGRs
Michael Gabler, Pablo Cerdá-Durán, Nikolaos Stergioulas +2
Our numerical simulations show that axisymmetric, torsional, magneto-elastic oscillations of magnetars with a superfluid core can explain the whole range of observed quasi-periodic…
Numerical Relativity in Spherical Polar Coordinates: Evolution Calculations with the BSSN Formulation
Thomas W. Baumgarte, Pedro J. Montero, Isabel Cordero-Carrión +1
In the absence of symmetry assumptions most numerical relativity simulations adopt Cartesian coordinates. While Cartesian coordinates have some desirable properties, spherical pola…
Three-dimensional neutrino-driven supernovae: Neutron star kicks, spins, and asymmetric ejection of nucleosynthesis products
A. Wongwathanarat, H. -Th. Janka, E. Mueller
We present 3D simulations of supernova (SN) explosions of nonrotating stars, triggered by the neutrino-heating mechanism with a suitable choice of the core-neutrino luminosity. Our…
Magneto-elastic oscillations of neutron stars: exploring different magnetic field configurations
Michael Gabler, Pablo Cerdá-Durán, José A. Font +2
We study magneto-elastic oscillations of highly magnetized neutron stars (magnetars) which have been proposed as an explanation for the quasi-periodic oscillations (QPOs) appearing…
Fast time variations of supernova neutrino signals from 3-dimensional models
Tina Lund, Annop Wongwathanarat, Hans-Thomas Janka +2
We study supernova neutrino flux variations in the IceCube detector, using 3D models based on a simplified neutrino transport scheme. The hemispherically integrated neutrino emissi…
Magneto-elastic oscillations of neutron stars with dipolar magnetic fields
Michael Gabler, Pablo Cerdá Durán, Nikolaos Stergioulas +2
By means of two dimensional, general-relativistic, magneto-hydrodynamical simulations we investigate the oscillations of magnetized neutron star models (magnetars) including the de…
Relativistic collapse and explosion of rotating supermassive stars with thermonuclear effects
Pedro J. Montero, Hans-Thomas Janka, Ewald Mueller
We present results of general relativistic simulations of collapsing supermassive stars with and without rotation using the two-dimensional general relativistic numerical code Nada…