The Astrophysical Journal

The Astrophysical Journal

Quick search Find article
Quick search
Find article
The Astrophysical Journal Volume 668 Number 2 Create an alert RSS this journal

D. M. Townsley et al. 2007 ApJ 668 1118 doi:10.1086/521013

Flame Evolution During Type Ia Supernovae and the Deflagration Phase in the Gravitationally Confined Detonation Scenario

FREE ISSUE

D. M. Townsley1,2, A. C. Calder1,3,4, S. M. Asida5, I. R. Seitenzahl2,6, F. Peng1,2,3,7, N. Vladimirova3, D. Q. Lamb1,3,6 and J. W. Truran1,2,3,6,8

Show affiliations

Tag this article Full text PDF (1.20 MB) HTML with Enhancements

Abstract References Cited By

We develop an improved method for tracking the nuclear flame during the deflagration phase of a Type Ia supernova and apply it in a study of the variation in outcomes expected from the gravitationally confined detonation (GCD) paradigm. A simplified three-stage burning model and a nonstatic ash state are integrated with an artificially thickened advection-diffusion-reaction (ADR) flame front in order to provide an accurate but highly efficient representation of the energy release and electron capture in and after the unresolvable flame. We demonstrate that neither our ADR nor our energy release methods generate significant acoustic noise, as has been a problem with previous ADR-based schemes. We proceed to model aspects of the deflagration, particularly the role of buoyancy of the hot ash, and find that our methods are reasonably well behaved with respect to numerical resolution. We show that if a detonation occurs in material swept up by the material ejected by the first rising bubble but gravitationally confined to the white dwarf (WD) surface (the GCD paradigm), the density structure of the WD at detonation is systematically correlated with the distance of the deflagration ignition point from the center of the star. Coupled to a suitably stochastic ignition process, this correlation may provide a plausible explanation for the variety of nickel masses seen in Type Ia supernovae.


Subject headings

hydrodynamics; nuclear reactions, nucleosynthesis, abundances; supernovae: general; white dwarfs


Dates

Issue 2 (2007 October 20)

Received 2007 March 13, accepted for publication 2007 June 7



Your last 10 viewed
  1. Flame Evolution During Type Ia Supernovae and the Deflagration Phase in the Gravitationally Confined Detonation Scenario

    D. M. Townsley et al. 2007 ApJ 668 1118

  2. Electron-polar optical phonon scattering suppression and mobility enhancement in wurtzite heterostructures

    E P Pokatilov et al 2007 J. Phys.: Conf. Ser. 92 012050

  3. The electrical asymmetry effect in capacitively coupled radio frequency discharges – measurements of dc self bias, ion energy and ion flux

    J Schulze et al 2009 J. Phys. D: Appl. Phys. 42 092005

  4. Acoustic phonon engineering of thermal properties of silicon-based nanostructures

    N D Zincenco et al 2007 J. Phys.: Conf. Ser. 92 012086

  5. The size-quantized oscillations of the optical-phonon-limited electron mobility in AlN/GaN/AlN nanoscale heterostructures

    E P Pokatilov et al 2007 J. Phys.: Conf. Ser. 92 012022

  6. Observation of Extended Very High Energy Emission from the Supernova Remnant IC 443 with VERITAS

    V. A. Acciari et al 2009 ApJ 698 L133

  7. Nonlinear dynamics of dual frequency capacitive discharges: a global model matched to an experiment

    Dennis Ziegler et al 2008 Plasma Sources Sci. Technol. 17 045011

  8. The gain and loss of energy by electrons in the RF-CCP sheath

    Brian George Heil et al 2009 J. Phys. D: Appl. Phys. 42 085205

  9. Helium Sedimentation and the Ultraviolet Upturn in Brightest Cluster Galaxies

    Fang Peng and Daisuke Nagai 2009 ApJ 705 L58

  10. Equity in climate–economy scenarios: the importance of subnational income distribution

    Paul Baer 2009 Environ. Res. Lett. 4 015007

Users also read

What's this?
This innovative new feature generates a list of articles 'also read' by other users based on them reading the original article. Article abstracts citations and references are all considered and weighted accordingly. We hope that this will help you find relevant papers for your research.

  1. Evaluating Systematic Dependencies of Type Ia Supernovae: The Influence of Progenitor 22Ne Content on Dynamics
  2. Study of the Detonation Phase in the Gravitationally Confined Detonation Model of Type Ia Supernovae
  3. The Response of Model and Astrophysical Thermonuclear Flames to Curvature and Stretch
More

Share

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.