Magnetohydrodynamical Effects on Nuclear Deflagration Fronts in Type Ia Supernovae

Hristov, Boyan; Collins, David C.; Hoeflich, Peter; Weatherford, Charles A.; Diamond, Tiara R.

doi:10.3847/1538-4357/aab7f2

Title: Magnetohydrodynamical Effects on Nuclear Deflagration Fronts in Type Ia Supernovae

Journal Article · Fri Apr 27 00:00:00 EDT 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aab7f2· OSTI ID:1542023

Hristov, Boyan ^[1];

^[2];

^[2]; Weatherford, Charles A. ^[3];

^[4]

Florida A & M Univ., Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
Florida State Univ., Tallahassee, FL (United States)
Florida A & M Univ., Tallahassee, FL (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

This article introduces a report of the effects of magnetic fields on non-distributed nuclear burning fronts as a possible solution to a fundamental problem for the thermonuclear explosion of a Chandrasekhar mass ($${M}_{\mathrm{Ch}}$$) white dwarf (WD), the currently favored scenario for the majority of Type Ia SNe. All existing 3D hydrodynamical simulations predict strong global mixing of the burning products due to Rayleigh–Taylor (RT) instabilities, which contradicts observations. As a first step toward studying the flame physics, we present a set of computational magnet-hydrodynamic models in rectangular flux tubes, resembling a small inner region of a WD. We consider initial magnetic fields up to $${10}^{12}\,{\rm{G}}$$ of various orientations. We find an increasing suppression of RT instabilities starting at about $${10}^{9}\,{\rm{G}}$$. The front speed tends to decrease with increasing magnitude up to about $${10}^{11}\,{\rm{G}}$$. For even higher fields new small-scale, finger-like structures develop, which increase the burning speed by a factor of 3 to 4 above the field-free RT-dominated regime. We imply that the new instability may provide sufficiently accelerated energy production during the distributed burning regime to go over the Chapman–Jougey limit and trigger a detonation. Furthermore, we discuss the possible origins of high magnetic fields during the final stage of the progenitor evolution or the explosion.

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Research Organization:: Florida A & M University, Tallahassee, FL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: NA0002630

OSTI ID:: 1542023

Journal Information:: The Astrophysical Journal (Online), Vol. 858, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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