Explosive nucleosynthesis in the neutrino-driven aspherical supernova explosion of a non-rotating 15 M star with solar metallicity

Shin Ichiro Fujimoto, Kei Kotake, Masa Aki Hashimoto, Masaomi Ono, Naofumi Ohnishi

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Abstract

We investigate explosive nucleosynthesis in a non-rotating 15 M star with solar metallicity that explodes by a neutrino-heating supernova (SN) mechanism aided by both standing accretion shock instability (SASI) and convection. To trigger explosions in our two-dimensional hydrodynamic simulations, we approximate the neutrino transport with a simple light-bulb scheme and systematically change the neutrino fluxes emitted from the protoneutron star. By a post-processing calculation, we evaluate abundances and masses of the SN ejecta for nuclei with a mass number ≤70, employing a large nuclear reaction network. Aspherical abundance distributions, which are observed in nearby core-collapse SN remnants, are obtained for the non-rotating spherically symmetric progenitor, due to the growth of a low-mode SASI. The abundance pattern of the SN ejecta is similar to that of the solar system for models whose masses range between (0.4-0.5) M of the ejecta from the inner region (≤10, 000 km) of the precollapse core. For the models, the explosion energies and the 56Ni masses are ≃ 10 51erg and (0.05-0.06) M , respectively; their estimated baryonic masses of the neutron star are comparable to the ones observed in neutron-star binaries. These findings may have little uncertainty because most of the ejecta is composed of matter that is heated via the shock wave and has relatively definite abundances. The abundance ratios for Ne, Mg, Si, and Fe observed in the Cygnus loop are reproduced well with the SN ejecta from an inner region of the 15 M progenitor.

Original languageEnglish
Article number61
JournalAstrophysical Journal
Volume738
Issue number1
DOIs
Publication statusPublished - Sep 1 2011

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M stars
ejecta
nuclear fusion
metallicity
supernovae
explosive
explosions
explosion
neutrinos
neutron stars
shock
accretion
supernova remnants
shock wave
nuclear reactions
solar system
luminaires
shock waves
convection
actuators

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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Explosive nucleosynthesis in the neutrino-driven aspherical supernova explosion of a non-rotating 15 M star with solar metallicity. / Fujimoto, Shin Ichiro; Kotake, Kei; Hashimoto, Masa Aki; Ono, Masaomi; Ohnishi, Naofumi.

In: Astrophysical Journal, Vol. 738, No. 1, 61, 01.09.2011.

Research output: Contribution to journalArticle

Fujimoto, Shin Ichiro ; Kotake, Kei ; Hashimoto, Masa Aki ; Ono, Masaomi ; Ohnishi, Naofumi. / Explosive nucleosynthesis in the neutrino-driven aspherical supernova explosion of a non-rotating 15 M star with solar metallicity. In: Astrophysical Journal. 2011 ; Vol. 738, No. 1.
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