The influence of deflagration to detonation transition density on type Ia supernovae

Alan C. Calder, Aaron P. Jackson, Brendan K. Krueger, Dean M. Townsley, David A. Chamulak, Edward F. Brown, Francis Timmes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A widely accepted setting for type Ia supernovae (SNeIa) is a thermonuclear runaway occurring in a C/O white dwarf (WD) that gained mass from a companion. The peak brightness is determined by the mass of radioactive 56Ni synthesized that powers the light curve. Models that best agree with observations begin with a subsonic deflagration that transitions to a supersonic detonation that rapidly incinerates the star. The condition under which the deflagration-to-detonation transition (DDT) occurs is largely uncertain and remains essentially a free parameter. We parameterize the DDT in terms of the local density because the characteristics of the burning wave dependmost sensitively on density. We present a study of the role of transition density in the DDT paradigm [1]. We apply a theoretical framework for statistically studying systematic effects using two-dimensional simulations that begin with a central deflagration having randomized perturbations. The DDT occurs when any rising plumes reach a specified density. We find a quadratic dependence of Fe-group yield on the log of DDT density. Assuming the DDT density depends on metallicity, we find the 56Ni yield decreases 0.067±0. 004M⊙ for a 1 Z⊙ increase in metallicity.

Original languageEnglish (US)
Title of host publicationProceedings of Science
StatePublished - 2010
Event11th Symposium on Nuclei in the Cosmos, NIC 2010 - Heidelberg, Germany
Duration: Jul 19 2010Jul 23 2010

Other

Other11th Symposium on Nuclei in the Cosmos, NIC 2010
CountryGermany
CityHeidelberg
Period7/19/107/23/10

ASJC Scopus subject areas

  • General

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    Calder, A. C., Jackson, A. P., Krueger, B. K., Townsley, D. M., Chamulak, D. A., Brown, E. F., & Timmes, F. (2010). The influence of deflagration to detonation transition density on type Ia supernovae. In Proceedings of Science