Query : 2022A&A...659A..27L

2022A&A...659A..27L - Astronomy and Astrophysics, volume 659A, 27-27 (2022/3-1)

Models of pulsationally assisted gravitationally confined detonations with different ignition conditions.


Abstract (from CDS):

Over the past decades, many explosion scenarios for Type Ia supernovae have been proposed and investigated including various combinations of deflagrations and detonations in white dwarfs of different masses up to the Chandrasekhar mass. One of these is the gravitationally confined detonation model. In this case a weak deflagration burns to the surface, wraps around the bound core, and collides at the antipode. A subsequent detonation is then initiated in the collision area. Since the parameter space for this scenario, that is, varying central densities and ignition geometries, has not been studied in detail, we used pure deflagration models of a previous parameter study dedicated to Type Iax supernovae as initial models to investigate the gravitationally confined detonation scenario. We aim to judge whether this channel can account for one of the many subgroups of Type Ia supernovae, or even normal events. To this end, we employed a comprehensive pipeline for three-dimensional Type Ia supernova modeling that consists of hydrodynamic explosion simulations, nuclear network calculations, and radiative transfer. The observables extracted from the radiative transfer are then compared to observed light curves and spectra. The study produces a wide range in masses of synthesized 56Ni ranging from 0.257 to 1.057 M, and, thus, can potentially account for subluminous as well as overluminous Type Ia supernovae in terms of brightness. However, a rough agreement with observed light curves and spectra can only be found for 91T-like objects. Although several discrepancies remain, we conclude that the gravitationally confined detonation model cannot be ruled out as a mechanism to produce 91T-like objects. However, the models do not provide a good explanation for either normal Type Ia supernovae or Type Iax supernovae.

Abstract Copyright: © ESO 2022

Journal keyword(s): hydrodynamics - nuclear reactions, nucleosynthesis, abundances - radiative transfer - methods: numerical - supernovae: general - supernovae: individual: SN 1991T

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 SN 2000cx SN* 01 24 46.1 +09 30 31           SNIap 211 1
2 SN 2012Z SN* 03 22 05.39641 -15 23 14.9390           SNIax 117 1
3 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 255 1
4 SN 2011ay SN* 07 02 34.1 +50 35 25           SNIax 42 1
5 SN 1994D SN* 12 34 02.395 +07 42 05.70   11.75 12.03     SNIa 537 1
6 SN 1991T SN* 12 34 10.20 +02 39 56.4   11.70 11.51     SNIapec 757 1
7 SN 2011fe SN* 14 03 05.711 +54 16 25.22   10.12 10.06     SNIa-norm 635 1
8 SN 2006bt SN* 15 56 33.81 +20 03 07.2     17.5     SNIap 95 1

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