Metallicity effect in multi-dimensional SNIa nucleosynthesis

¹ Istituto Nazionale di Astrofisica (INAF) - Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (Torino), Italy e-mail: travaglio@to.astro.it
² Max-Planck Institut für Astrophysik, Karl-Schwarzschild Strasse 1, 85741 Garching bei München, Germany

Received: 15 February 2005
Accepted: 18 July 2005

Abstract

We investigate the metallicity effect (measured by the original ²²Ne content) on the detailed nucleosynthetic yields for 3D hydrodynamical simulations of the thermonuclear burning phase in type Ia supernovae (SNe Ia). Calculations are based on post-processes of the ejecta, using passively advected tracer particles. The nuclear reaction network employed in computing the explosive nucleosynthesis contains 383 nuclear species, ranging from neutrons, proton, and α-particles to ⁹⁸Mo. we use the high resolution multi-point ignition (bubbles) model b30_3d_768, and we cover a metallicity range between and . We find a linear dependence of the ejected ⁵⁶Ni mass on the progenitor's metallicity, with a variation in the ⁵⁶Ni mass of ~25% in the metallicity range explored. The largest variation in ⁵⁶Ni occurs at metallicity greater than solar. Almost no variations are shown in the unburned material ¹²C and ¹⁶O. The largest metallicity effect is seen in the α-elements. Implications for the observed scatter in the peak luminosities of SNe Ia are also discussed.