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Title: Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition

Abstract

Type Ia Supernovae (SNe Ia) are believed to be thermonuclear explosions of a white dwarf. They can be used as mature cosmological standardized candles, leading to the discovery of the accelerating expansion of the Universe. However, the explosion mechanism has not yet been fully clarified. In this paper, we first present nucleosynthetic features of a leading explosion scenario, namely a delayed-detonation scenario. Based on this, we propose a new and strong observational constraint on the explosion mechanism through emission lines from neutron-rich Fe-peaks. Especially, we show that an asymmetry in the explosion is likely a generic feature. We further argue that the diversity arising from various viewing angles can be an origin of observational diversities of SNe Ia seen in their spectral features (suspected possible biases in cosmology) and colors (related to the extinction estimate in cosmology). Using these new insights could open up a possibility of using SNe Ia as more precise distance indicators than currently employed.

Authors:
 [1]
  1. Institute for the Physics and Mathematics of the Universe (IPMU), Todai Institutes for Advanced Study (TODIAS), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)
Publication Date:
OSTI Identifier:
22075762
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1484; Journal Issue: 1; Conference: Conference on origin of matter and evolution of galaxies 2011, Wako (Japan), 14-17 Nov 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; COSMOLOGY; INFLATIONARY UNIVERSE; IRON ISOTOPES; NEUTRON-RICH ISOTOPES; NEUTRONS; NUCLEOSYNTHESIS; SUPERNOVAE; THERMONUCLEAR EXPLOSIONS; THERMONUCLEAR IGNITION; UNIVERSE; WHITE DWARF STARS

Citation Formats

Maeda, Keiichi. Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition. United States: N. p., 2012. Web. doi:10.1063/1.4763413.
Maeda, Keiichi. Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition. United States. doi:10.1063/1.4763413.
Maeda, Keiichi. Mon . "Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition". United States. doi:10.1063/1.4763413.
@article{osti_22075762,
title = {Nucleosynthesis in type Ia supernovae driven by asymmetric thermonuclear ignition},
author = {Maeda, Keiichi},
abstractNote = {Type Ia Supernovae (SNe Ia) are believed to be thermonuclear explosions of a white dwarf. They can be used as mature cosmological standardized candles, leading to the discovery of the accelerating expansion of the Universe. However, the explosion mechanism has not yet been fully clarified. In this paper, we first present nucleosynthetic features of a leading explosion scenario, namely a delayed-detonation scenario. Based on this, we propose a new and strong observational constraint on the explosion mechanism through emission lines from neutron-rich Fe-peaks. Especially, we show that an asymmetry in the explosion is likely a generic feature. We further argue that the diversity arising from various viewing angles can be an origin of observational diversities of SNe Ia seen in their spectral features (suspected possible biases in cosmology) and colors (related to the extinction estimate in cosmology). Using these new insights could open up a possibility of using SNe Ia as more precise distance indicators than currently employed.},
doi = {10.1063/1.4763413},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1484,
place = {United States},
year = {2012},
month = {11}
}