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Title: Carbon Deflagration in Type Ia Supernova. I. Centrally Ignited Models

Journal Article · · The Astrophysical Journal
 [1];  [1];  [1];  [2];  [2]
  1. Univ. of California, Santa Cruz, CA (United States). Dept. of Astronomy and Astrophysics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Computational Sciences and Engineering

A leading model for Type Ia supernovae (SNe Ia) begins with a white dwarf near the Chandrasekhar mass that ignites a degenerate thermonuclear runaway close to its center and explodes. In a series of papers, we shall explore the consequences of ignition at several locations within such dwarfs. In this paper, we assume central ignition, which has been explored before, but is worth revisiting, if only to validate those previous studies and to further elucidate the relevant physics for future work. A perturbed sphere of hot iron ash with a radius of ~100 km is initialized at the middle of the star. The subsequent explosion is followed in several simulations using a thickened flame model in which the flame speed is either fixed—within the range expected from turbulent combustion—or based on the local turbulent intensity. Global results, including the explosion energy and bulk nucleosynthesis (e.g., 56Ni of 0.48-0.56 M) turn out to be insensitive to this speed. In all completed runs, the energy released by the nuclear burning is adequate to unbind the star, but not enough to give the energy and brightness of typical SNe Ia. As found previously, the chemical stratification observed in typical events is not reproduced. These models produce a large amount of unburned carbon and oxygen in central low velocity regions, which is inconsistent with spectroscopic observations, and the intermediate mass elements and iron group elements are strongly mixed during the explosion.

Research Organization:
Univ. of California, Santa Cruz, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; FC02-06ER41438
OSTI ID:
1565018
Journal Information:
The Astrophysical Journal, Vol. 771, Issue 1; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (13)

Large Eddy Simulations in Astrophysics journal October 2015
Observational properties of thermonuclear supernovae journal August 2019
Three-dimensional pure deflagration models with nucleosynthesis and synthetic observables for Type Ia supernovae journal December 2013
Polarization spectral synthesis for Type Ia supernova explosion models journal April 2015
The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger? journal April 2016
A unified mechanism for unconfined deflagration-to-detonation transition in terrestrial chemical systems and type Ia supernovae journal October 2019
Electron-capture Supernovae of Super-AGB Stars: Sensitivity on Input Physics journal January 2020
Large Eddy Simulations in Astrophysics preprint January 2014
Polarisation spectral synthesis for Type Ia supernova explosion models text January 2015
Dark Matter Triggers of Supernovae text January 2015
The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger? text January 2016
Electron Capture Supernovae of Super-AGB Stars: Sensitivity on Input Physics text January 2019
Type Iax Supernovae text January 2017