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Nucleosynthesis Constraints on the Explosion Mechanism for Type Ia Supernovae

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [4];  [5];  [4];  [6];  [7];  [7]
  1. Univ. of Tokyo (Japan); National Astronomical Observatory of Japan, Tokyo (Japan); none
  2. Western Michigan Univ., Kalamazoo MI (United States); National Astronomical Observatory of Japan, Tokyo (Japan)
  3. Univ. of Tokyo (Japan); National Astronomical Observatory of Japan, Tokyo (Japan); Beihang Univ., Beijing (China)
  4. National Astronomical Observatory of Japan, Tokyo (Japan); Nihon Univ., Tokyo (Japan)
  5. Univ. of Notre Dame, IN (United States)
  6. National Astronomical Observatory of Japan, Tokyo (Japan); Max Planck Inst. fur Extraterrestrische Physik, Garching (Germany)
  7. Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe
+ Show Author Affiliations

Observations of type Ia supernovae (SNe Ia) include information about the characteristic nucleosynthesis associated with these thermonuclear explosions. We consider observational constraints from iron-group elemental and isotopic ratios, to compare with various models obtained with the most realistic recent treatment of electron captures (ECs). The nucleosynthesis is sensitive to the highest white-dwarf central densities. Hence, nucleosynthesis yields can distinguish high-density Chandrasekhar-mass models from lower-density burning models such as white-dwarf mergers. We discuss new results of post-processing nucleosynthesis for two spherical models (deflagration and/or delayed-detonation models) based upon new EC rates. We also consider cylindrical and 3D explosion models (including deflagration, delayed-detonation, or a violent merger model). Although there are uncertainties in the observational constraints, we identify some trends in the observations and the models. We make a new comparison of the models with elemental and isotopic ratios from five observed supernovae and three supernova remnants. We find that the models and data tend to fall into two groups. In one group, low-density cores such as in a 3D merger model are slightly more consistent with the nucleosynthesis data, while the other group is slightly better identified with higher-density cores such as in single-degenerate 1D–3D deflagration models. Hence, we postulate that both types of environments appear to contribute nearly equally to observed SN Ia. We also note that observational constraints on the yields of 54Cr and 54Fe, if available, might be used as a means to clarify the degree of geometrical symmetry of SN Ia explosions.

Research Organization:
Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-95ER40934
OSTI ID:
1511017
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 863; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

The Intrinsic Stochasticity of the 56 Ni Distribution of Single-degenerate Near-Chandrasekhar-mass SN Ia journal June 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
nuclear reactions
nucleosynthesis
abundances – supernovae: general – white dwarfs