TY  - GEN
A1  - Lach, Florian
N2  - 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 chemical evolution studies.
TI  - Chandrasekhar mass explosions of white dwarfs
as a model for type Ia supernovae and
their contribution to cosmic nucleosynthesis
AV  - public
ID  - heidok31666
Y1  - 2022///
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/31666/
CY  - Heidelberg
ER  -