Environment of the Solar System formation: Estimate from the initial abundance of short-lived radionuclides

Abstract

We applied nucleosynthesis yields in type II supernovae with mixing-fall back to the initial abundances of short-lived radionuclides, once existed in the early solar system. The initial abundances of 26Al, 41Ca, 53Mn, 60Fe and the lower limit of 36Cl can be explained by injection of the ejecta from a type II supernova of a massive star (>25Msolar) to the solar system with dilution of 10^-4-10^-5 and a time interval of 0.8-1 Myr. This indicates that the solar system was born neaby a massive star.