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primary topic: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis

Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis
type: Article
abstract: Although type Ia supernovae are widely applied as cosmological distance indicators and contribute significantly to the enrichment of the Universe with iron group elements, their physi- cal nature is not clear yet. The heterogeneous class of type Ia supernovae is divided into several subtypes according to their observational properties, and a whole variety of possible explosion scenarios has been put forward in order to explain these extraordinarily bright events. The focus of this work lies on the numerical modeling of explosions in Chandrasekhar mass carbon-oxygen white dwarfs as well as on the investigation of the nucleosynthesis yields of several explosion chan- nels. To this end, numerical simulations of the explosion, the propagation of radiation through the expanding debris, and the galactic chemical evolution of the Milky Way were conducted. It was found that, in line with earlier studies, deflagrations in Chandrasekhar mass white dwarfs are a viable model for type Iax supernovae, a subluminous subclass of type Ia supernovae. However, the parameter study employing different ignition conditions, central densities, metallicities, com- position and rigid rotation revealed that the very faint end of the subclass can not be reproduced. Furthermore, a set of gravitationally confined detonation simulations has been carried out. In this scenario an initial deflagration is followed by a detonation initiated near the surface of the white dwarf core. It could be shown that the synthetic observables do not agree with either normal or subluminous type Ia supernovae but that objects similar to SN 1991T might be explained by this explosion mechanism. Finally, the nucleosynthesis yields of various different explosion models were analyzed. This study shows that explosions in sub-Chandrasekhar mass white dwarfs with an accreted helium shell can contribute significantly to the abundance of manganese, zinc, and copper in the Universe and should be included in future galactic che…
date: 2022
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
has document: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
subject: 500 Naturwissenschaften und Mathematik
subject: 520 Astronomie
subject: 530 Physik

Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
type: Document
has file: PhD_FlorianLach.pdf
has part: PhD_FlorianLach.pdf

Florian Lach
type: Person
given name: Florian
family name: Lach

Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
type: Document
is version of: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
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Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
type: Document
is version of: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
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Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
type: Document
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Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
type: Document
is version of: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
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Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (Other)
type: Document
is version of: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
is volatile version of: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis (PDF)
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primary topic: Chandrasekhar mass explosions of white dwarfs as a model for type Ia supernovae and their contribution to cosmic nucleosynthesis

500 Naturwissenschaften und Mathematik
type: Concept
preferred label: 500 Natural sciences and mathematics @en

520 Astronomie
type: Concept
preferred label: 520 Astronomy and allied sciences @en

530 Physik
type: Concept
preferred label: 530 Physics @en