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The moon and the planets

, Volume 19, Issue 2, pp 169–184 | Cite as

Chemical condensation sequences in supernova ejecta

  • James M. Lattimer
  • Lawrence Grossman
Article

Abstract

The mineralogical composition of grains produced in supernova ejecta is explored via chemical equilibrium condensation computations. These calculations are carried out for chemical compositions characteristic of each of several supernova zones, taking into account the pressure decrease due to adiabatic expansion and condensation. The distributions of the major elements among the various gaseous species and solid phases are graphically displayed. These computations reveal that many of the major condensates from supernova ejecta are also stable against evaporation in a gas of solar composition at high temperatures. This is especially true for minerals containing the elements O, Mg, Al, Si, Ca, Fe and Ti. Grains which form in supernova ejecta are less likely to become homogenized with solar nebular gas than SN gas and are thus potential sources of exotic isotopic compositions in the early solar system. The calculated elemental distributions of supernova condensates are applied to problems concerning isotopic anomalies and large mass-dependent isotopic fractionations discovered in the meteorite Allende. The order in which the major elements become totally condensed is found to be nearly independent of the supernova zone considered, being the same as that for a solar gas. The consequence of this may be that some of the observed depletions of heavy elements in the interstellar gas are due to supernova-produced dust.

Keywords

Dust Major Element Chemical Equilibrium Isotopic Fractionation Gaseous Species 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1978

Authors and Affiliations

  • James M. Lattimer
    • 1
  • Lawrence Grossman
    • 2
  1. 1.Department of AstronomyUniversity of Illinois at Urbana-ChampaignUSA
  2. 2.Dept. of Geophysical Sciences, and Enrico Fermi InstituteThe University of ChicagoUSA

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