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Title: Sub-Chandrasekhar-mass White Dwarf Detonations Revisited

Abstract

The detonation of a sub-Chandrasekhar-mass white dwarf (WD) has emerged as one of the most promising Type Ia supernova (SN Ia) progenitor scenarios. Recent studies have suggested that the rapid transfer of a very small amount of helium from one WD to another is sufficient to ignite a helium shell detonation that subsequently triggers a carbon core detonation, yielding a "dynamically driven double-degenerate double-detonation" SN Ia. Because the helium shell that surrounds the core explosion is so minimal, this scenario approaches the limiting case of a bare C/O WD detonation. Motivated by discrepancies in previous literature and by a recent need for detailed nucleosynthetic data, we revisit simulations of naked C/O WD detonations in this paper. We disagree to some extent with the nucleosynthetic results of previous work on sub-Chandrasekhar-mass bare C/O WD detonations; for example, we find that a median-brightness SN Ia is produced by the detonation of a 1.0 $${M}_{\odot }$$ WD instead of a more massive and rarer 1.1 $${M}_{\odot }$$ WD. The neutron-rich nucleosynthesis in our simulations agrees broadly with some observational constraints, although tensions remain with others. There are also discrepancies related to the velocities of the outer ejecta and light curve shapes, but overall our synthetic light curves and spectra are roughly consistent with observations. We are hopeful that future multidimensional simulations will resolve these issues and further bolster the dynamically driven double-degenerate double-detonation scenario's potential to explain most SNe Ia.

Authors:
 [1];  [2];  [3]; ORCiD logo [3]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy and Theoretical Astrophysics Center; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy and Theoretical Astrophysics Center; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Physics
  3. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1524341
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 854; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; binaries: close; nuclear reactions, nucleosynthesis, abundances; radiative transfer; supernovae: general; white dwarfs

Citation Formats

Shen, Ken J., Kasen, Daniel, Miles, Broxton J., and Townsley, Dean M. Sub-Chandrasekhar-mass White Dwarf Detonations Revisited. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aaa8de.
Shen, Ken J., Kasen, Daniel, Miles, Broxton J., & Townsley, Dean M. Sub-Chandrasekhar-mass White Dwarf Detonations Revisited. United States. https://doi.org/10.3847/1538-4357/aaa8de
Shen, Ken J., Kasen, Daniel, Miles, Broxton J., and Townsley, Dean M. Mon . "Sub-Chandrasekhar-mass White Dwarf Detonations Revisited". United States. https://doi.org/10.3847/1538-4357/aaa8de. https://www.osti.gov/servlets/purl/1524341.
@article{osti_1524341,
title = {Sub-Chandrasekhar-mass White Dwarf Detonations Revisited},
author = {Shen, Ken J. and Kasen, Daniel and Miles, Broxton J. and Townsley, Dean M.},
abstractNote = {The detonation of a sub-Chandrasekhar-mass white dwarf (WD) has emerged as one of the most promising Type Ia supernova (SN Ia) progenitor scenarios. Recent studies have suggested that the rapid transfer of a very small amount of helium from one WD to another is sufficient to ignite a helium shell detonation that subsequently triggers a carbon core detonation, yielding a "dynamically driven double-degenerate double-detonation" SN Ia. Because the helium shell that surrounds the core explosion is so minimal, this scenario approaches the limiting case of a bare C/O WD detonation. Motivated by discrepancies in previous literature and by a recent need for detailed nucleosynthetic data, we revisit simulations of naked C/O WD detonations in this paper. We disagree to some extent with the nucleosynthetic results of previous work on sub-Chandrasekhar-mass bare C/O WD detonations; for example, we find that a median-brightness SN Ia is produced by the detonation of a 1.0 ${M}_{\odot }$ WD instead of a more massive and rarer 1.1 ${M}_{\odot }$ WD. The neutron-rich nucleosynthesis in our simulations agrees broadly with some observational constraints, although tensions remain with others. There are also discrepancies related to the velocities of the outer ejecta and light curve shapes, but overall our synthetic light curves and spectra are roughly consistent with observations. We are hopeful that future multidimensional simulations will resolve these issues and further bolster the dynamically driven double-degenerate double-detonation scenario's potential to explain most SNe Ia.},
doi = {10.3847/1538-4357/aaa8de},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 854,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2018},
month = {Mon Feb 12 00:00:00 EST 2018}
}

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Figures / Tables:

Figure 1 Figure 1: Synthesized IME (top panel) and 56Ni (middle panel) masses and total nuclear energy release (bottom panel) vs. minimum cell size allowed in the simulation for detonations of 1.0 $M$ 50/50 C/O solar-metallicity WDs. Dashed lines represent the results from our hydrodynamic simulations, which use a 41-isotope network, formore » a maximum relative temperature change per time step of |$Δ$ 1n $T$|max = 0.02 (thin red dashed), 0.04 (medium blue dashed), and 0.08 (thick yellow dashed). Postprocessed results using a 205-isotope network are shown as solid lines for |$Δ$ 1n $T$|max = 0.02 (thin red solid), 0.04 (medium blue solid), and 0.08 (thick yellow solid). Circles in the top panel show the minimum cell sizes of the convergence study for reference.« less

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Models for Type I supernova. I - Detonations in white dwarfs
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Sub-Chandrasekhar mass models for Type IA supernovae
journal, March 1994

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A CHANDRASEKHAR MASS PROGENITOR FOR THE TYPE Ia SUPERNOVA REMNANT 3C 397 FROM THE ENHANCED ABUNDANCES OF NICKEL AND MANGANESE
journal, March 2015


Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82
journal, January 2018


CfA3: 185 TYPE Ia SUPERNOVA LIGHT CURVES FROM THE CfA
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  • Mark, Everett,; Kyle, Smalley,; Diab, Jerius,
  • The University of North Carolina at Chapel Hill University Libraries
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TYPE Iax SUPERNOVAE: A NEW CLASS OF STELLAR EXPLOSION
text, January 2013

  • W., Jha, S.; J., Challis, P.; E., Reichart, D.
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Spontaneous Initiation of Detonations in White Dwarf Environments: Determination of Critical Sizes
text, January 2009


Rates and Delay Times of Type Ia Supernovae
text, January 2009


Late-time supernova light curves: The effect of internal conversion and Auger electrons
text, January 2009


Surface Detonations in Double Degenerate Binary Systems Triggered by Accretion Stream Instabilities
text, January 2009


Remnants of Binary White Dwarf Mergers
text, January 2011


Constraining Type Ia supernova models: SN 2011fe as a test case
text, January 2012


Towards an understanding of Type Ia supernovae from a synthesis of theory and observations
preprint, January 2013


On Silicon Group Elements Ejected by Supernovae Type Ia
text, January 2013


Observational clues to the progenitors of Type-Ia supernovae
text, January 2013


Two classes of fast-declining type Ia supernovae
text, January 2017


On Variations in the Peak Luminosity of Type Ia Supernovae
text, January 2003


Constraints on the Physics of Type Ia Supernovae from the X-Ray Spectrum of the Tycho Supernova Remnant
text, January 2005


Capturing the Fire: Flame Energetics and Neutronizaton for Type Ia Supernova Simulations
text, January 2006


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Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties
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A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate
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The radial distribution of supernovae compared to star formation tracers
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SN 2012fr: Ultraviolet, Optical, and Near-infrared Light Curves of a Type Ia Supernova Observed within a Day of Explosion
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Type Ia Supernovae in the First Few Days: Signatures of Helium Detonation versus Interaction
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Three Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-degenerate Double-detonation Type Ia Supernovae
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Quantifying How Density Gradients and Front Curvature Affect Carbon Detonation Strength during SNe Ia
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Spectral Sequences of Type Ia Supernovae. II. Carbon as a Diagnostic Tool for Explosion Mechanisms
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Properties of Type-Ia Supernova Light Curves
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From Supernova to Supernova Remnant: The Three-dimensional Imprint of a Thermonuclear Explosion
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Evidence for Sub-Chandrasekhar Type Ia Supernovae from Stellar Abundances in Dwarf Galaxies
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Remnants of Subdwarf Helium Donor Stars Ejected from Close Binaries with Thermonuclear Supernovae
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SN Ia Explosions from Hybrid Carbon–Oxygen–Neon White Dwarf Progenitors that Have Mixed during Cooling
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ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf
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Partly burnt runaway stellar remnants from peculiar thermonuclear supernovae
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The Two Most Recent Thermonuclear Supernovae in the Local Group: Radio Constraints on their Progenitors and Evolution
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Common envelope to explosion delay time of Type Ia supernovae
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Models and simulations for the photometric lsst astronomical time series classification challenge (Plasticc)
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Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters
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Type Ia Supernovae in the First Few Days: Signatures of Helium Detonation versus Interaction
text, January 2018


General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
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