RECORD
The Role of Electron Captures in Chandrasekhar Mass Models for Type Ia Supernovae
Astrophysics · Submitted 26 Jan 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Making use of these new shell model based rates, we present the first results for the composition of Fe-group nuclei produced in the central regions of SNe Ia and possible changes in the constraints on model parameters like ignition densities and burning front speeds.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
The Chandrasekhar mass model for Type Ia Supernovae (SNe Ia) has received increasing support from recent comparisons of observations with light curve predictions and modeling of synthetic spectra. It explains SN Ia events via thermonuclear explosions of accreting white dwarfs in binary stellar systems, being caused by central carbon ignition when the white dwarf approaches the Chandrasekhar mass. As the electron gas in white dwarfs is degenerate, characterized by high Fermi energies for the high density regions in the center, electron capture on intermediate mass and Fe-group nuclei plays an important role in explosive burning. Electron capture affects the central electron fraction Y_e, which determines the composition of the ejecta from such explosions. Up to the present, astrophysical tabulations based on shell model matrix elements were only available for light nuclei in the sd-shell. Recently new Shell Model Monte Carlo (SMMC) and large-scale shell model diagonalization calculations have also been performed for pf-shell nuclei. These lead in general to a reduction of electron capture rates in comparison with previous, more phenomenological, approaches. Making use of these new shell model based rates, we present the first results for the composition of Fe-group nuclei produced in the central regions of SNe Ia and possible changes in the constraints on model parameters like ignition densities and burning front speeds.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The Chandrasekhar mass model for Type Ia Supernovae (SNe Ia) has received increasing support from recent comparisons of observations with light curve predictions and modeling of synthetic spectra. | background 1.00 | 0.06 | 0.04 | asserted 0.90 |
| s1 | It explains SN Ia events via thermonuclear explosions of accreting white dwarfs in binary stellar systems, being caused by central carbon ignition when the white dwarf approaches the Chandrasekhar mass. | background 1.00 | 0.05 | 0.04 | asserted 1.00 |
| s2 | As the electron gas in white dwarfs is degenerate, characterized by high Fermi energies for the high density regions in the center, electron capture on intermediate mass and Fe-group nuclei plays an important role in explosive burning. | background 1.00 | 0.05 | 0.04 | asserted 1.00 |
| s3 | Electron capture affects the central electron fraction Y_e, which determines the composition of the ejecta from such explosions. | background 0.99 | 0.06 | 0.06 | asserted 1.00 |
| s4 | Up to the present, astrophysical tabulations based on shell model matrix elements were only available for light nuclei in the sd-shell. | gap 0.99 | 0.04 | 0.02 | asserted 1.00 |
| s5 | Recently new Shell Model Monte Carlo (SMMC) and large-scale shell model diagonalization calculations have also been performed for pf-shell nuclei. | background 0.81 | 0.22 | 0.03 | asserted 1.00 |
| s6 | These lead in general to a reduction of electron capture rates in comparison with previous, more phenomenological, approaches. | result 0.57 | 0.21 | 0.16 | asserted 0.85 |
| s7 | Making use of these new shell model based rates, we present the first results for the composition of Fe-group nuclei produced in the central regions of SNe Ia and possible changes in the constraints on model parameters like ignition densities and burning front speeds. | contribution 0.96 | 0.95 | 0.54 | asserted 0.73 |
What was examined, and what was not
- arXiv listing abstract v1
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
The Chandrasekhar mass model for Type Ia Supernovae (SNe Ia) has received increasing support from recent comparisons of observations with light curve predictions and modeling of synthetic spectra. It explains SN Ia events via thermonuclear explosions of accreting white dwarfs in binary stellar systems, being caused by central carbon ignition when the white dwarf approaches the Chandrasekhar mass. As the electron gas in white dwarfs is degenerate, characterized by high Fermi energies for the high density regions in the center, electron capture on intermediate mass and Fe-group nuclei plays an important role in explosive burning. Electron capture affects the central electron fraction Y_e, which determines the composition of the ejecta from such explosions. Up to the present, astrophysical tabulations based on shell model matrix elements were only available for light nuclei in the sd-shell. Recently new Shell Model Monte Carlo (SMMC) and large-scale shell model diagonalization calculations have also been performed for pf-shell nuclei. These lead in general to a reduction of electron capture rates in comparison with previous, more phenomenological, approaches. Making use of these new shell model based rates, we present the first results for the composition of Fe-group nuclei produced in the central regions of SNe Ia and possible changes in the constraints on model parameters like ignition densities and burning front speeds.
Human review
How the literature uses it
3 arXiv papers cite this in 6 sentences
Papers citing it · 4 sentences without a confident label
Uses its data or values 1 paper
-
For observed SNe Ia, the central densities within the framework of spherical models range from $≈8 - 50 ×10^8 g cm^-3$, producing between 0.01 to 0.15 $M_⊙$ of $^58$Ni, respectively [ref] .
The Production of Electron-Capture Elements in Thermonuclear Supernovae: Theory vs. Observations · Conclusions · 0.87
Cites it as background 1 paper
-
The EC rates have been modified over the years, thanks to advances in both computational methods and nuclear experiments [ref] .
The Production of Electron-Capture Elements in Thermonuclear Supernovae: Theory vs. Observations · Introduction · 0.99
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.