2013/07/31 by Min Long, George C. Jordan IV, G. C. Jordan +12 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astrophysics #Deflagration #Detonation #Ejecta #Explosive material #Gamma-ray bursts and supernovae #Ignition system #Kinetic energy #Light curve #Nuclear physics #Nuclear physics research studies #Physics #Plasma #Quantum mechanics #RADIUS #Supernova #Thermodynamics #Thermonuclear fusion #astro-ph.HE #astro-ph.SR
paper · pdf · doi:10.1088/0004-637x/789/2/103
Submitted to ApJ, 23 pages, 19 figures. A 3D animation is provided at http://flash.uchicago.edu/~long/PureDef/8km-PureDef-DDT-Compositions-1365x768.mp4
arxiv created 2014/05/13 · openalex publication_date 2014/06/19 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a systematic study of the pure deflagration model of Type Ia supernovae (SNe Ia) using three-dimensional, high-resolution, full-star hydrodynamical simulations, nucleosynthetic yields calculated using Lagrangian tracer particles, and light curves calculated using radiation transport. We evaluate the simulations by comparing their predicted light curves with many observed SNe Ia using the SALT2 data-driven model and find that the simulations may correspond to under-luminous SNe Iax. We explore the effects of the initial conditions on our results by varying the number of randomly selected ignition points from 63 to 3500, and the radius of the centered sphere they are confined in from 128 to 384 km. We find that the rate of nuclear burning depends on the number of ignition points at early times, the density of ignition points at intermediate times, and the radius of the confining sphere at late times. The results depend primarily on the number of ignition points, but we do not expect this to be the case in general. The simulations with few ignition points release more nuclear energy E nuc , have larger kinetic energies E K , and produce more 56 Ni than those with many ignition points, and differ in the distribution of 56 Ni, Si, and C/O in the ejecta. For these reasons, the simulations with few ignition points exhibit higher peak B -band absolute magnitudes M B and light curves that rise and decline more quickly; their M B and light curves resemble those of under-luminous SNe Iax, while those for simulations with many ignition points are not.