2017MNRAS.471.4275Y

We investigate the nucleosynthesis that occurs during the two-dimensional neutrino-driven explosion of ultra-stripped Type Ic supernovae evolved from 1.45 and 1.5 M_☉ CO stars. These supernovae explode with an explosion energy of ∼10⁵⁰ erg and release ejecta of mass ∼0.1 M_☉. The light trans-iron elements Ga-Zr are produced in the neutrino-irradiated ejecta. The abundance distribution of these elements has a large uncertainty because of the uncertainty of the electron fraction of the neutrino-irradiated ejecta. The yield of the elements will be less than 0.01 M_☉. Ultra-stripped supernovae and core-collapse supernovae evolved from a light CO core could be the main sources of light trans-iron elements. They could also produce the neutron-rich nuclei ⁴⁸Ca. Ultra-stripped supernovae eject ∼0.006-0.01 M_☉ of ⁵⁶Ni. If most of the neutrino-irradiated ejecta is proton-rich, ⁵⁶Ni will be produced more abundantly. The light-curves of these supernovae indicate a subluminous fast-decaying explosion with a peak magnitude of about -15 to -16. Future observations of ultra-stripped supernovae could constrain the event rate of a class of neutron star mergers.