Understanding the early chemical evolution of the Galaxy requires to understand the nucleosynthesis in the supernovae of the first generations of stars. The properties of these massive stars and of their explosions determine the nucleosynthesis patterns we expect. Unfortunately, direct observation of these supernovae will remain difficult except for some special cases. Conversely, indeed,...
After the Big Bang nucleosynthesis, the first heavy element enrichment in the Universe was made by a supernova (SN) explosion of a population (Pop) III star (Pop III SN). The abundance ratios of elements produced from Pop III SNe are recorded in abundance patterns of extremely metal-poor (EMP) stars. The observations of the increasing number of EMP stars have made it possible to statistically...
We develop the code to fit observed elemental abundance patterns with the supernova yield models of the first (metal-free) stars. The yield models of first-star's masses in the range 13-100Msun with several different explosion energies are calculated based on the mixing-fallback model to approximately take into account the mixing and fallback of elements in aspherical explosions. We use this...
It is remarkable that quite a large diversity of supernova properties have been observed (e.g., very faint and superluminous supernovae, weak and extremely energetic explosions). Some unusual supernovae might have important influences in Pop III era. We examine the origin and nucleosynthesis properties of such unusual supernovae, and compare them with the abundance patterns observed in...
Nowadays in the nearby Universe astronomers detect about 10 supernovae (SNe) per day. All these SNe lead to the formation of metal-rich stars in billions of years after the explosion. In the coming years in the distant Universe or metal-free gas pockets we expect the detection of the first SNe. Their progenitors are zero-metal, compact stars and the explosion leads to the formation of...
Recent stellar nucleosynthesis yield survey of massive star has demonstrated the needs of highly aspherical explosion in massive stars, i.e. bipolar jet-induced explosion [Grimmett et al., MNRAS 479, 495 (2018)]. Such explosion model is known to be the candidate for explaining the carbon-enhanced metal-poor stars. However, so far there is very little understanding to explore or constrain...
