Title:
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Surface and core detonations in rotating white dwarfs
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Author:
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García Senz, Domingo; Cabezón Gómez, Rubén Martín; Domínguez, I.
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica |
Abstract:
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The feasibility of the double detonation mechanism—surface helium detonation followed by complete carbon
detonation of the core—in a rotating white dwarf with mass ;1Me is studied using three-dimensional
hydrodynamic simulations. A rapid rigid rotation of the white dwarf was assumed, so that its initial spherical
geometry is considerably distorted. Unlike spherically symmetric models, we found that when helium ignition is
located far from the spinning axis, the detonation fronts converge asynchronically at the antipodes of the ignition
point. Nevertheless, the detonation of the carbon core still remains as the most probable outcome. The detonation
of the core gives rise to a strong explosion, matching many of the basic observational constraints of Type Ia
supernovae (SNe Ia). We conclude that the double detonation mechanism also works when the white dwarf is
rapidly rotating. These results provide further evidence for the viability of sub-Chandrasekhar-mass models as well
as some double degenerate models (those having some helium fuel at the merging moment), making them
appealing channels for the production of SN Ia events. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica -Hydrodynamics -Nuclear reactions -White dwarf stars -hydrodynamics – methods: numerical – nuclear reactions -nucleosynthesis -abundances – stars: rotation –
supernovae: general – white dwarfs -Hidrodinàmica -Reaccions nuclears |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Article |
Published by:
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Institute of Physics (IOP)
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