Flames in Type Ia Supernova: Deflagration-detonation Transition in the Oxygen-burning Flame

Details Flames in Type Ia Supernova: Deflagration-detonation Transition in the Oxygen-burning Flame Flames in Type Ia Supernova: Deflagration-detonation Transition in the Oxygen-burning Flame

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...734...37w&link_type=abstract

The Astrophysical Journal, Volume 734, Issue 1, article id. 37 (2011).

Astronomy and Astrophysics

Astronomy

1

Hydrodynamics, Methods: Numerical, Shock Waves, Supernovae: General, Turbulence

Scientific paper

The flame in a Type Ia supernova is a conglomerate structure that, depending on density, may involve separate regions of carbon, oxygen, and silicon burning, all propagating in a self-similar, subsonic front. The separation between these three burning regions increases as the density declines until eventually, below about 2 × 107 g cm-3, only carbon burning remains active, the other two burning phases having "frozen out" on stellar scales. Between 2 and 3 × 107 g cm-3, however, there remains an energetic oxygen-burning region that trails the carbon burning by an amount that is sensitive to the turbulence intensity. As the carbon flame makes a transition to the distributed regime (Karlovitz number >~ 10), the characteristic separation between the carbon- and oxygen-burning regions increases dramatically, from a fraction of a meter to many kilometers. The oxygen-rich mixture between the two flames is created at a nearly constant temperature, and turbulence helps to maintain islands of well-mixed isothermal fuel as the temperature increases. The delayed burning of these regions can be supersonic and could initiate a detonation.

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