Explosive Nucleosynthesis in Sub-Chandrasekhar mass Type Ia Supernovae: Dependence on Model Parameters. (arXiv:1901.10007v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Leung_S/0/1/0/all/0/1">Shing-Chi Leung</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nomoto_K/0/1/0/all/0/1">Ken'ichi Nomoto</a>
Recent observations of Type Ia supernovae (SNe Ia) have shown diversified
properties of the explosion strength, light curves and chemical composition. To
investigate possible origins of such diversities in SNe Ia, we have presented
multi-dimensional hydrodynamical study of explosions and associated
nucleosynthesis in the near Chandrasekhar mass carbon-oxygen (CO) white dwarfs
(WDs) for wide parameters (Leung and Nomoto ApJ 861, 143, 2018). In the present
paper, we extend our wide parameter survey of models to the explosions of
sub-Chandrasekhar mass CO WDs. We take the double detonation model for the
explosion mechanism. The model parameters of the survey include metallicity of
$Z = 0 – 5$ $Z_odot$, the mass of the CO WD progenitor of $M = 0.90 – 1.20$
$M_odot$, the He envelope mass of $M_{rm He} = 0.05 – 0.20$ $M_odot$. We
also study how the initial He detonation configuration affects the triggering
of the C detonation. For these parameters, we first derive the minimum He
envelope mass necessary to trigger the C detonation. We then examine how the
explosion dynamics and associated nucleosynthesis depend on these parameters,
and compare our results with the previous representative models. We compare our
nucleosynthesis yields with the unusual abundance patterns of Fe-peak elements
and isotopes observed in SNe Ia 2011fe, 2012cg, 2014J, and SN Ia remnant 3C 397
to provide constraints on their progenitors and environments. We provide the
nucleosynthesis yields table of the sub-Chandrasekhar mass explosions, to
discuss their roles in the galactic chemical evolution and archaeology.
Recent observations of Type Ia supernovae (SNe Ia) have shown diversified
properties of the explosion strength, light curves and chemical composition. To
investigate possible origins of such diversities in SNe Ia, we have presented
multi-dimensional hydrodynamical study of explosions and associated
nucleosynthesis in the near Chandrasekhar mass carbon-oxygen (CO) white dwarfs
(WDs) for wide parameters (Leung and Nomoto ApJ 861, 143, 2018). In the present
paper, we extend our wide parameter survey of models to the explosions of
sub-Chandrasekhar mass CO WDs. We take the double detonation model for the
explosion mechanism. The model parameters of the survey include metallicity of
$Z = 0 – 5$ $Z_odot$, the mass of the CO WD progenitor of $M = 0.90 – 1.20$
$M_odot$, the He envelope mass of $M_{rm He} = 0.05 – 0.20$ $M_odot$. We
also study how the initial He detonation configuration affects the triggering
of the C detonation. For these parameters, we first derive the minimum He
envelope mass necessary to trigger the C detonation. We then examine how the
explosion dynamics and associated nucleosynthesis depend on these parameters,
and compare our results with the previous representative models. We compare our
nucleosynthesis yields with the unusual abundance patterns of Fe-peak elements
and isotopes observed in SNe Ia 2011fe, 2012cg, 2014J, and SN Ia remnant 3C 397
to provide constraints on their progenitors and environments. We provide the
nucleosynthesis yields table of the sub-Chandrasekhar mass explosions, to
discuss their roles in the galactic chemical evolution and archaeology.
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