Dust formation and survival in supernova ejecta

摘要: The presence of dust at high redshift requires efficient condensation grains in SN ejecta, accordance with current theoretical models. Yet, observations the few well studied SNe and remnants imply efficiencies which are about two orders magnitude smaller. Motivated by this tension, we have (i) revisited model Todini & Ferrara (2001) for formation ejecta core collapse (ii) followed, first time, evolution newly condensed from time to their survival - through passage reverse shock remnant. We find that 0.1 0.6 M⊙ form 12 40 stellar progenitors. Depending on density surrounding ISM, between 2-20% initial mass survives shock, time-scales 4 8×10 yr explosion. Sputtering hot gas induces a shift size distribution towards smaller grains. resulting extinction curve shows good agreement derived reddened QSO z = 6.2. Stochastic heating small leads wide temperatures. This supports idea large amounts (� 0.1M⊙) cold (T � 40K) can be present remnants, without being conflict observed IR emission.