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dc.contributor.authorBravo Guil, Eduardo
dc.contributor.authorGarcía Senz, Domingo
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.date.accessioned2013-04-22T13:01:43Z
dc.date.available2013-04-22T13:01:43Z
dc.date.created2008-02
dc.date.issued2008-02
dc.identifier.citationBravo, E.; Garcia, D. A three-dimensional picture of the delayed-detonation model of type Ia supernovae. "Astronomy and astrophysics", Febrer 2008, vol. 478, núm. 3, p. 843-853.
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/2117/18919
dc.description.abstractAims. Deflagration models poorly explain the observed diversity of SNIa. Current multidimensional simulations of SNIa predict a significant amount of, so far unobserved, carbon and oxygen moving at low velocities. It has been proposed that these drawbacks can be resolved if there is a sudden jump to a detonation (delayed detonation), but these kinds of models have been explored mainly in one dimension. Here we present new three-dimensional delayed detonation models in which the deflagraton-to-detonation transition (DDT) takes place in conditions like those favored by one-dimensional models. Methods. We have used a smoothed-particle-hydrodynamics code adapted to follow all the dynamical phases of the explosion, with algorithms devised to handle subsonic as well as supersonic combustion fronts. The starting point was a centrally ignited C–O white dwarf of 1.38 M . When the average density on the flame surface reached ∼2−3 × 107 g cm−3 a detonation was launched. Results. The detonation wave processed more than 0.3 M of carbon and oxygen, emptying the central regions of the ejecta of unburned fuel and raising its kinetic energy close to the fiducial 1051 erg expected from a healthy type Ia supernova. The final amount of 56Ni synthesized also was in the correct range. However, the mass of carbon and oxygen ejected is still too high. Conclusions. The three-dimensional delayed detonation models explored here show an improvement over pure deflagration models, but they still fail to coincide with basic observational constraints. However, there are many aspects of the model that are still poorly known (geometry of flame ignition, mechanism of DDT, properties of detonation waves traversing a mixture of fuel and ashes). Therefore, it will be worth pursuing its exploration to see if a good SNIa model based on the three-dimensional delayed detonation scenario can be obtained.
dc.format.extent11 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Física::Astronomia i astrofísica
dc.subject.lcshSupernovae
dc.titleA three-dimensional picture of the delayed-detonation model of type Ia supernovae
dc.typeArticle
dc.subject.lemacSupernoves
dc.contributor.groupUniversitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
dc.identifier.doi10.1051/0004-6361:20078424
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.aanda.org/
dc.rights.accessOpen Access
drac.iddocument1222275
dc.description.versionPostprint (published version)
upcommons.citation.authorBravo, E.; Garcia, D.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameAstronomy and astrophysics
upcommons.citation.volume478
upcommons.citation.number3
upcommons.citation.startingPage843
upcommons.citation.endingPage853


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