Abundance stratification in Type Ia Supernovae - II: The rapidly declining, spectroscopically normal SN 2004eo - AstrophysicsReport as inadecuate




Abundance stratification in Type Ia Supernovae - II: The rapidly declining, spectroscopically normal SN 2004eo - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The variation of properties of Type Ia supernovae, the thermonuclearexplosions of Chandrasekhar-mass carbon-oxygen white dwarfs, is caused bydifferent nucleosynthetic outcomes of these explosions, which can be tracedfrom the distribution of abundances in the ejecta. The compositionstratification of the spectroscopically normal but rapidly declining SN2004eois studied performing spectrum synthesis of a time-series of spectra obtainedbefore and after maximum, and of one nebular spectrum obtained about eightmonths later. Early-time spectra indicate that the outer ejecta are dominatedby oxygen and silicon, and contain other intermediate-mass elements IME,implying that the outer part of the star was subject only to partial burning.In the inner part, nuclear statistical equilibrium NSE material dominates,but the production of 56Ni was limited to ~0.43 \pm 0.05 Msun. An innermostzone containing ~0.25 Msun of stable Fe-group material is also present. Therelatively small amount of NSE material synthesised by SN2004eo explains boththe dimness and the rapidly evolving light curve of this SN.



Author: P. A. Mazzali, D. N. Sauer, A. Pastorello, S. Benetti, W. Hillebrandt

Source: https://arxiv.org/







Related documents