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Abstract: Two-dimensional simulations of mixing and fall back in non-rotating massivestars have been carried out using realistic initial models for the presupernovastar and assuming standard spherically symmetric explosions of 1.2*10^51ergs.Stars of 15 and 25 solar masses with both primordial and solar composition weremodeled. The zero metallicity supernova progenitors were compact blue stars andthe amount of Rayleigh-Taylor induced mixing in them was greatly reducedcompared with what was seen in the red supergiants with solar metallicity. Thecompact zero-metal stars also experienced more fallback than their solarmetallicity counterparts. As a result, the ejected nucleosynthesis from the twopopulations was very different. For the simple explosion model assumed, lowmetallicity stars ejected ejected too little iron and intermediate masselements even to explain the abundance patterns in the most iron-poor starsfound to date, suggesting that some important ingredient is missing. Rotationis likely to alter these conclusions by producing a greater fraction of redsupergiants among Population III stars. The velocities of the heavy elements inall models considered - both red and blue supergiants - were less than observedin SN 1987A, suggesting that at least occasionally, asymmetric aspects of theexplosion mechanism and fallback play a major role in mixing.



Author: C.C. Joggerst, S.E. Woosley, Alexander Heger

Source: https://arxiv.org/



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