scholarly journals One-dimensional delayed-detonation models of Type Ia supernovae: confrontation to observations at bolometric maximum

2012 ◽  
Vol 429 (3) ◽  
pp. 2127-2142 ◽  
Author(s):  
Stéphane Blondin ◽  
Luc Dessart ◽  
D. John Hillier ◽  
Alexei M. Khokhlov
Keyword(s):  
Type Ia Supernovae ◽  
One Dimensional ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals Understanding nebular spectra of Type Ia supernovae

2020 ◽  
Vol 494 (2) ◽  
pp. 2221-2235 ◽  
Author(s):  
Kevin D Wilk ◽  
D John Hillier ◽  
Luc Dessart
Keyword(s):  
Radiative Transfer ◽  
Local Thermodynamic Equilibrium ◽  
Diagnostic Feature ◽  
Type Ia Supernovae ◽  
Thermal Heating ◽  
One Dimensional ◽  
Type Ia ◽  
Natural Mechanism ◽  
Non Local ◽  
Ia Supernovae

ABSTRACT In this study, we present one-dimensional, non-local-thermodynamic-equilibrium, radiative transfer simulations (using cmfgen) in which we introduce micro-clumping at nebular times into two Type Ia supernova ejecta models. We use one sub-Chandrasekhar (sub-MCh) ejecta model with 1.04 M⊙ and one Chandrasekhar (MCh) ejecta model with 1.40 M⊙. We introduce clumping factors f = 0.33, 0.25, and 0.10, which are constant throughout the ejecta, and compare results to the unclumped f = 1.0 case. We find that clumping is a natural mechanism to reduce the ionization of the ejecta, reducing emission from [Fe iii], [Ar iii], and [S iii] by a factor of a few. For decreasing values of the clumping factor f, the [Ca ii] λλ7291,7324 doublet became a dominant cooling line for our MCh model but remained weak in our sub-MCh model. Strong [Ca ii] λλ7291,7324 indicates non-thermal heating in that region and may constrain explosion modelling. Due to the low abundance of stable nickel, our sub-MCh model never showed the [Ni ii] 1.939-μm diagnostic feature for all clumping values.

scholarly journals Light Curve Models for SN 2009dc

2011 ◽  
Vol 7 (S281) ◽  
pp. 314-315
Author(s):  
Yasuomi Kamiya
Keyword(s):  
Light Curve ◽  
White Dwarfs ◽  
Light Curves ◽  
Host Galaxy ◽  
Type Ia Supernovae ◽  
Radiation Hydrodynamics ◽  
One Dimensional ◽  
Type Ia ◽  
Ia Supernovae

AbstractSimplified explosion models of super-Chandrasekhar-mass C-O white dwarfs (WDs) are constructed with parameters such as WD mass and 56Ni mass. Their light curves are obtained by solving one-dimensional equations of radiation hydrodynamics, and compared with the observations of SN 2009dc, one of the overluminous Type Ia supernovae, to estimate its properties. As a result, the progenitor of SN 2009dc is suggested to be a 2.2–2.4-M⊙ C-O WD with 1.2–1.4 M⊙ of 56Ni, if the extinction by its host galaxy is negligible.

scholarly journals The accuracy of post-processed nucleosynthesis

2020 ◽  
Vol 494 (2) ◽  
pp. 3037-3047
Author(s):  
Eduardo Bravo
Keyword(s):  
Nuclear Energy ◽  
Abundant Species ◽  
Type Ia Supernovae ◽  
Post Processing ◽  
One Dimensional ◽  
Type Ia ◽  
Order Of Magnitude ◽  
Stable Elements ◽  
Ia Supernovae ◽  
Better Than

ABSTRACT The computational requirements posed by multi-dimensional simulations of type Ia supernovae make it difficult to incorporate complex nuclear networks to follow the release of nuclear energy along with the propagation of the flame. Instead, these codes usually model the flame and use simplified nuclear kinetics, with the goal of determining a sufficiently accurate rate of nuclear energy generation and, afterwards, post-processing the thermodynamic trajectories with a large nuclear network to obtain more reliable nuclear yields. In this work, I study the performance of simplified nuclear networks with respect to reproduction of the nuclear yields obtained with a one-dimensional supernova code equipped with a large nuclear network. I start by defining a strategy to follow the properties of matter in nuclear statistical equilibrium (NSE). I propose to use published tables of NSE properties, together with a careful interpolation routine. Short networks (iso7 and 13α) are able to give an accurate yield of 56Ni, after post-processing, but can fail by order of magnitude in predicting the ejected mass of even mildly abundant species (>10−3 M⊙). A network of 21 species reproduces the nucleosynthesis of the Chandrasekhar and sub-Chandrasekhar explosions studied here with average errors better than 20 per cent for the whole set of stable elements and isotopes followed in the models.

Unified One‐Dimensional Simulations of Gamma‐Ray Line Emission from Type Ia Supernovae

2004 ◽  
Vol 613 (2) ◽  
pp. 1101-1119 ◽  
Author(s):  
P. A. Milne ◽  
A. L. Hungerford ◽  
C. L. Fryer ◽  
T. M. Evans ◽  
T. J. Urbatsch ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Line Emission ◽  
Type Ia Supernovae ◽  
One Dimensional ◽  
Type Ia ◽  
Ia Supernovae

Hard X‐Rays and Gamma Rays from Type Ia Supernovae

1998 ◽  
Vol 492 (1) ◽  
pp. 228-245 ◽  
Author(s):  
P. Hoflich ◽  
J. C. Wheeler ◽  
A. Khokhlov
Keyword(s):  
Gamma Rays ◽  
Type Ia Supernovae ◽  
X Rays ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals Gravitational Collapse versus Thermonuclear Explosion of Degenerate Stellar Cores

1994 ◽  
Vol 147 ◽  
pp. 186-213
Author(s):  
J. Isern ◽  
R. Canal
Keyword(s):  
Neutron Star ◽  
White Dwarfs ◽  
Light Curves ◽  
Type Ia Supernovae ◽  
Radioactive Elements ◽  
Border Line ◽  
Thermonuclear Explosion ◽  
Type Ia ◽  
Γ Rays ◽  
Ia Supernovae

AbstractIn this paper we review the behavior of growing stellar degenerate cores. It is shown that ONeMg white dwarfs and cold CO white dwarfs can collapse to form a neutron star. This collapse is completely silent since the total amount of radioactive elements that are expelled is very small and a burst of γ-rays is never produced. In the case of an explosion (always carbonoxygen cores), the outcome fits quite well the observed properties of Type Ia supernovae. Nevertheless, the light curves and the velocities measured at maximum are very homogeneous and the diversity introduced by igniting at different densities is not enough to account for the most extreme cases observed. It is also shown that a promising way out of this problem could be the He-induced detonation of white dwarfs with different masses. Finally, we outline that the location of the border line which separetes explosion from collapse strongly depends on the input physics adopted.

scholarly journals A Novel Color Parameter as a Luminosity Calibrator for Type Ia Supernovae

2005 ◽  
Vol 620 (2) ◽  
pp. L87-L90 ◽  
Author(s):  
Xiaofeng Wang ◽  
Lifan Wang ◽  
Xu Zhou ◽  
Yu-Qing Lou ◽  
Zongwei Li
Keyword(s):  
Type Ia Supernovae ◽  
Color Parameter ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals Kernel PCA for Type Ia supernovae photometric classification

2013 ◽  
Vol 430 (1) ◽  
pp. 509-532 ◽  
Author(s):  
E. E. O. Ishida ◽  
R. S. de Souza
Keyword(s):  
Type Ia Supernovae ◽  
Kernel Pca ◽  
Type Ia ◽  
Ia Supernovae
Sign in / Sign up

Export Citation Format

Share Document