547 citations · 7.4k across the 72 of their papers we have counts for
74 papers
Early galactic heavy element production - a phenomenological approach
B. Wehmeyer, D. Blaschke, F. K. Röpke +1
The high abundances of heavy elements in early, extremely metal-poor stars is still an unsolved issue in Galactic Chemical Evolution (GCE). Standard approaches, such as mergers of…
Observable Signatures of Supernova Shock Breakout in Confined Circumstellar Medium
Wun-Yi Chen, Ke-Jung Chen, Keiichi Maeda +1
Supernova shock breakout encodes rich information about stellar explosions, including the properties of the progenitor, the explosion mechanism, and the circumstellar environment.…
Helium as a signature of the double detonation in Type Ia supernovae
Christine E. Collins, Stuart A. Sim, Luke. J. Shingles +5
The double detonation is a widely discussed mechanism to explain Type Ia supernovae from explosions of sub-Chandrasekhar mass white dwarfs. In this scenario, a helium detonation is…
Towards a self-consistent model of the convective core boundary in upper main sequence stars. Part I: 2.5D and 3D simulations
R. Andrassy, G. Leidi, J. Higl +3
There is strong observational evidence that the convective cores of intermediate-mass and massive main sequence stars are substantially larger than those predicted by standard stel…
Type Ia Supernova Explosions in Binary Systems: A Review
Zheng-Wei Liu, Friedrich K. Roepke, Zhanwen Han
SNe Ia play a key role in the fields of astrophysics and cosmology. It is widely accepted that SNe Ia arise from thermonuclear explosions of WDs in binaries. However, there is no c…
Simulations of common-envelope evolution in binary stellar systems: physical models and numerical techniques
Friedrich K. Roepke, Orsola De Marco
When the primary star in a close binary system evolves into a giant and engulfs its companion, its core and the companion temporarily orbit each other inside a common envelope. Dra…
A finite-volume scheme for modeling compressible magnetohydrodynamic flows at low Mach numbers in stellar interiors
G. Leidi, C. Birke, R. Andrassy +5
Fully compressible magnetohydrodynamic (MHD) simulations are a fundamental tool for investigating the role of dynamo amplification in the generation of magnetic fields in deep conv…
General relativistic moving-mesh hydrodynamics simulations with AREPO and applications to neutron star mergers
Georgios Lioutas, Andreas Bauswein, Theodoros Soultanis +3
We implement general relativistic hydrodynamics in the moving-mesh code AREPO. We also couple a solver for the Einstein field equations employing the conformal flatness approximati…
Long-term evolution of post-explosion Helium-star Companions of Type Iax Supernovae
Yaotian Zeng, Zheng-Wei Liu, Alexander Heger +3
Supernovae of Type Iax (SNe Iax) are an accepted faint subclass of hydrogen-free supernovae. Their origin, the nature of the progenitor systems, however, is an open question. Recen…
Astrophysics with the Laser Interferometer Space Antenna
Pau Amaro Seoane, Jeff Andrews, Manuel Arca Sedda +156
The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it will offer unique opportunities to address many…
Models of pulsationally assisted gravitationally confined detonations with different ignition conditions
F. Lach, F. P. Callan, S. A. Sim +1
Over the past decades, many explosion scenarios for Type Ia supernovae have been proposed and investigated including various combinations of deflagrations and detonations in white…
From 3D hydrodynamic simulations of common-envelope interaction to gravitational-wave mergers
Melvin M. Moreno, Fabian R. N. Schneider, Friedrich K. Roepke +4
Modeling the evolution of progenitors of gravitational-wave merger events in binary stars faces two major uncertainties: the common-envelope phase and supernova kicks. These two pr…
Dynamics in a stellar convective layer and at its boundary: Comparison of five 3D hydrodynamics codes
R. Andrassy, J. Higl, H. Mao +18
Our ability to predict the structure and evolution of stars is in part limited by complex, 3D hydrodynamic processes such as convective boundary mixing. Hydrodynamic simulations he…
Bipolar planetary nebulae from common envelope evolution of binary stars
P. A. Ondratschek, F. K. Roepke, F. R. N. Schneider +5
Asymmetric shapes and evidence for binary central stars suggest a common-envelope origin for many bipolar planetary nebulae. The bipolar components of the nebulae are observed to e…
Second order finite volume scheme for Euler equations with gravity which is well-balanced for general equations of state and grid systems
Jonas P. Berberich, Praveen Chandrashekar, Christian Klingenberg +1
We develop a second order well-balanced finite volume scheme for compressible Euler equations with a gravitational source term. The well-balanced property holds for arbitrary hydro…
Testing a one-dimensional prescription of dynamical shear mixing with a two-dimensional hydrodynamic simulation
Philipp V. F. Edelmann, Friedrich K. Roepke, Raphael Hirschi +2
The treatment of mixing processes is still one of the major uncertainties in 1D stellar evolution models. This is mostly due to the need to parametrize and approximate aspects of h…
A numerical scheme for the compressible low-Mach number regime of ideal fluid dynamics
Wasilij Barsukow, Philipp V. F. Edelmann, Christian Klingenberg +2
Based on the Roe solver a new technique that allows to correctly represent low Mach number flows with a discretization of the compressible Euler equations was proposed in Miczek et…
Constructing stable 3D hydrodynamical models of giant stars
Sebastian T. Ohlmann, Friedrich K. Roepke, Rüdiger Pakmor +1
Hydrodynamical simulations of stellar interactions require stable models of stars as initial conditions. Such initial models, however, are difficult to construct for giant stars be…
Extreme Scale-out SuperMUC Phase 2 - lessons learned
Nicolay Hammer, Ferdinand Jamitzky, Helmut Satzger +36
In spring 2015, the Leibniz Supercomputing Centre (Leibniz-Rechenzentrum, LRZ), installed their new Peta-Scale System SuperMUC Phase2. Selected users were invited for a 28 day extr…
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…
Predicting polarization signatures for double-detonation and delayed-detonation models of Type Ia supernovae
M. Bulla, S. A. Sim, M. Kromer +8
Calculations of synthetic spectropolarimetry are one means to test multi-dimensional explosion models for Type Ia supernovae. In a recent paper, we demonstrated that the violent me…
Hydrodynamic moving-mesh simulations of the common envelope phase in binary stellar systems
Sebastian T. Ohlmann, Friedrich K. Roepke, Ruediger Pakmor +1
The common envelope (CE) phase is an important stage in binary stellar evolution. It is needed to explain many close binary stellar systems, such as cataclysmic variables, Type Ia…
Quantitative spectral analysis of the sdB star HD 188112: a helium-core white dwarf progenitor
M. Latour, U. Heber, A. Irrgang +7
HD 188112 is a bright (V = 10.2 mag) hot subdwarf B (sdB) star with a mass too low to ignite core helium burning and is therefore considered as a pre-extremely low mass (ELM) white…
Type Ia supernovae from violent mergers of carbon-oxygen white dwarfs: polarisation signatures
M. Bulla, S. A. Sim, R. Pakmor +5
The violent merger of two carbon-oxygen white dwarfs has been proposed as a viable progenitor for some Type Ia supernovae. However, it has been argued that the strong ejecta asymme…