Does the structure of Pop III supernova ejecta affect the elemental abundance of extremely metal-poor stars?

Abstract

The first generation of metal-free (Pop III) stars are crucial for the production of heavy elements in the earliest phase of structure formation. Their mass scale can be derived from the elemental abundance pattern of extremely metal-poor (EMP) stars, which are assumed to inherit the abundances of uniformly mixed supernova (SN) ejecta. If the expanding ejecta maintains its initial stratified structure, the elemental abundance pattern of EMP stars might be different from that from uniform ejecta. In this work we perform numerical simulations of the metal enrichment from stratified ejecta for normal core-collapse SNe (CCSNe) with a progenitor mass $25{\mathrm{M}}_{⨀}$ and explosion energies 0.7--10 B ($1\mathrm{B}=10^{51}$ erg). We find that SN shells fall back into the central minihalo in all models. In the recollapsing clouds, the abundance ratio $[M/Fe]$ for stratified ejecta is different from the one for uniform ejecta only within $\pm 0.4$ dex for any element M. We also find that, for the largest explosion energy (10 B), a neighboring halo is also enriched. Only the outer layers containing Ca or lighter elements reach the halo, where $[C/Fe]=1.49$. This means that C-enhanced metal-poor (CEMP) stars can form from the CCSN even with an average abundance ratio $[C/Fe]=-0.65$.

14 pages, 10 figures, 3 tables, accepted for publication in MNRAS

References in corpus (18)

• Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
• The Formation of Population III Binaries from Cosmological Initial Conditions
• An extremely primitive halo star
• Primordial Star Formation under the Influence of Far Ultraviolet Radiation: 1540 Cosmological Halos and the Stellar Mass Distribution
• The Mass Spectrum of the First Stars
• Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
• Aspherical Properties of Hydrodynamics and Nucleosynthesis in Jet-induced Supernovae
• Early turbulent mixing as the origin of chemical homogeneity in open star clusters
• Evidence for an aspherical Population III supernova explosion inferred from the hyper metal-poor star HE1327-2326
• Predicting the locations of possible long-lived low-mass first stars: Importance of satellite dwarf galaxies
• Classification of extremely metal-poor stars: absent region in A(C)-[Fe/H] plane and the role of dust cooling
• The Most Metal-Poor Stars. V. The CEMP-no Stars in 3D and Non-LTE
• Observational constraints on the survival of pristine stars
• The Supersonic Project: Shining Light on SIGOs - a New Formation Channel for Globular Clusters
• Formation of carbon-enhanced metal-poor stars as a consequence of inhomogeneous metal mixing
• Particle splitting in smoothed particle hydrodynamics based on Voronoi diagram
• Are Faint Supernovae Responsible for Carbon-Enhanced Metal-Poor Stars?
• Pre-supernova mixing in CEMP-no source stars