A5019000990- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- Astronomy and Astrophysical Research
- Nuclear physics research studies
- Neutrino Physics Research
- Solar and Space Plasma Dynamics
- Combustion and Detonation Processes
- Meteorological Phenomena and Simulations
- High-pressure geophysics and materials
- Fluid Dynamics and Turbulent Flows
- Galaxies: Formation, Evolution, Phenomena
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Astronomical and nuclear sciences
- Advanced Data Storage Technologies
- Nuclear Issues and Defense
- Numerical methods for differential equations
- Gas Dynamics and Kinetic Theory
Heidelberg University
2016-2025
Heidelberg Institute for Theoretical Studies
2016-2025
Queen's University Belfast
2018
University of Würzburg
2011-2017
Mount Stromlo Observatory
2016
ARC Centre of Excellence for All-sky Astrophysics
2016
Université Clermont Auvergne
2016
Clermont Université
2016
Laboratoire de Physique Corpusculaire
2016
Centre National de la Recherche Scientifique
2016
We present results for a suite of 14 three-dimensional, high-resolution hydrodynamical simulations delayed-detonation models Type Ia supernova (SN Ia) explosions. This model comprises the first set three-dimensional SN with detailed isotopic yield information. As such, it may serve as data base Chandrasekhar-mass nucleosynthetic yields and deriving synthetic observables such spectra light curves. employ physically motivated, stochastic based on turbulent velocity fluctuations fuel density to...
One of the most important questions regarding progenitor systems Type Ia supernovae (SNe Ia) is whether mergers two white dwarfs can lead to explosions that reproduce observations normal events. Here we present a fully three-dimensional simulation violent merger carbon-oxygen with masses $0.9 \mathrm{M_\odot}$ and $1.1 combining very high resolution exact initial conditions. A well-tested combination codes used study system. We start dynamical inspiral phase follow subsequent thermonuclear...
The explosion of sub-Chandrasekhar mass white dwarfs via the double detonation scenario is a potential explanation for type Ia supernovae. In this scenario, surface in helium layer initiates underlying carbon/oxygen core leading to an explosion. For given mass, lower bound has been determined on shell required dynamical burning during flash, which necessary prerequisite detonation. range and corresponding minimum masses, we investigate whether assumed capable triggering subsequent even...
Type Ia supernovae, the thermonuclear explosions of white dwarf stars composed carbon and oxygen, were instrumental as distance indicators in establishing acceleration universe's expansion. However, physics explosion are debated. Here we report a systematic spectral analysis large sample well-observed type supernovae. Mapping velocity distribution main products nuclear burning, constrain theoretical scenarios. We find that all supernovae have low-velocity cores stable iron-group elements....
Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it offer unique opportunities to address many key astrophysical questions in completely novel way. synergy with ground-based and space-born instruments the electromagnetic domain, by enabling multi-messenger observations, add further discovery potential of LISA. next decade is crucial prepare community LISA’s first observations. This review outlines...
Explosions of sub-Chandrasekhar-mass white dwarfs are one alternative to the standard Chandrasekhar-mass model Type Ia supernovae. They interesting since binary systems with primary should be common and this scenario would suggest a simple physical parameter which determines explosion brightness, namely mass exploding dwarf. Here we perform one-dimensional hydrodynamical simulations, associated post-processing nucleosynthesis multi-wavelength radiation transport calculations for pure...
We investigate whether pure deflagration models of Chandrasekhar-mass carbon–oxygen white dwarf stars can account for one or more subclass the observed population Type Ia supernova (SN Ia) explosions. compute a set 3D full-star hydrodynamic explosion models, in which strength is parametrized using multispot ignition approach. For each model, we calculate detailed nucleosynthesis yields post-processing step with 384 nuclide nuclear network. also synthetic observables our Monte Carlo radiative...
Abstract When the primary star in a close binary system evolves into giant and engulfs its companion, core companion temporarily orbit each other inside common envelope. Drag forces transfer orbital energy angular momentum to envelope material. Depending on efficiency of this process, may be ejected leaving behind tight remnant two stellar cores, or cores merge retaining part The exact outcome common-envelope evolution is critical for formation X-ray binaries, supernova progenitors,...
Abridged. In the double detonation scenario for Type Ia supernovae (SNe Ia) a initiates in shell of He-rich material accreted from companion star by sub-Chandrasekhar-mass White Dwarf (WD). This drives shock front into carbon-oxygen (C/O) WD that triggers secondary core. The core results complete disruption WD. Earlier studies concluded this has difficulties accounting observed properties SNe since explosion ejecta are surrounded products explosive He burning shell. Recently, it was proposed...
Aims.We present synthetic bolometric and broad-band UBVRI light curves of SNe Ia for four selected 3D deflagration models thermonuclear supernovae.
Type Ia supernovae are believed to be white dwarfs disrupted by a thermonuclear explosion. Here we investigate the scenario in which rather low-mass, carbon-oxygen (C + O) dwarf accumulates helium on its surface sufficient amount for igniting detonation shell before Chandrasekhar mass is reached. In principle, this can happen accreting from non-degenerate companion or merging C O with low-mass one. scenario, thought trigger secondary core. It therefore called “double-detonation...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
2002cx-like supernovae are a sub-class of sub-luminous Type Ia (SNe). Their light curves and spectra characterized by distinct features that indicate strong mixing the explosion ejecta. Pure turbulent deflagrations have been shown to produce such mixed Here, we present hydrodynamics, nucleosynthesis radiative-transfer calculations for 3D full-star deflagration Chandrasekhar-mass white dwarf. Our model is able reproduce characteristic observational SN 2005hk (a prototypical supernova), not...
The origin of subluminous Type Ia supernovae (SNe Ia) has long eluded any explanation, as all Chandrasekhar-mass models have severe problems reproducing them. Recently, it been proposed that violent mergers two white dwarfs 0.9 M_sun could lead to SNe events resemble 1991bg-like SNe~Ia. Here we investigate whether this scenario still works for with a mass ratio smaller than one. We aim determine the range ratios which detonation forms during merger, only those will SN Ia. This is an...
The nucleosynthetic characteristics of various explosion mechanisms Type Ia supernovae (SNe Ia) is explored based on three two-dimensional simulations representing extreme cases: a pure turbulent deflagration, delayed detonation following an approximately spherical ignition the initial and arising from highly asymmetric deflagration ignition. Apart this condition, stage treated in parameter-free approach. initiated when burning enters distributed regime. This occurs at densities around...
We explore SNe Ia as p-process sites in the framework of two-dimensional SN delayed detonation and pure deflagration models. The WD precursor is assumed to have reached Chandrasekhar mass a binary system by accretion from giant/main sequence companion. use enhanced s-seed distributions, obtained thermal pulse instabilities both AGB phase accreted material. apply tracer-particle method reconstruct nucleosynthesis histories Lagrangian particles, passively advected hydrodynamic calculations....
A simulation of the thermonuclear explosion a Chandrasekhar-mass C+O white dwarf, most popular scenario type Ia supernova (SN Ia), is presented. The underlying modeling pursued in self-consistent way, treating combustion wave as turbulent deflagration using well tested methods developed for laboratory and based on concept `large eddy simulations' (LES). Such consistency requires to capture onset cascade resolved scales. This achieved by computing dynamical evolution 1024$^3$ moving grid,...
The common envelope (CE) phase is an important stage in binary stellar evolution. It needed to explain many close systems, such as cataclysmic variables, Type Ia supernova progenitors, or X-ray binaries. To form the resulting binary, initial orbit has shrink, thereby transferring energy primary giant's that hence ejected. details of this interaction, however, are still not understood. Here, we present new hydrodynamic simulations dynamical spiral-in forming a CE system. We apply moving-mesh...
Context: Manganese is predominantly synthesised in Type Ia supernova (SN Ia) explosions. Owing to the entropy dependence of Mn yield explosive thermonuclear burning, SNe involving near Chandrasekhar-mass white dwarfs (WDs) are predicted produce Fe ratios significantly exceeding those SN explosions sub-Chandrasekhar mass primary WDs. Of all current explosion models, only models near-Chandrasekhar WDs [Mn/Fe] > 0.0. Aims: Using specific yields for competing scenarios, we aim constrain relative...
We present three-dimensional numerical simulations of turbulent combustion converting a neutron star into quark star. Hadronic matter, described by micro-physical finite-temperature equation state, is converted strange matter. assume this phase, represented bag-model to be absolutely stable. Following the example thermonuclear burning in white dwarfs leading Type Ia supernovae, we treat conversion process as potentially deflagration. Solving non-relativistic Euler equations using established...