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Date and Time of the Query: 2019-08-20 T18:11:09 PDT
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For refcode 1989ApJ...344..325K:
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1989ApJ...344..325K FORMATION OF DUST GRAINS IN THE EJECTA OF SN 1987A TAKASHI KOZASA AND HIROICHI HASEGAWA Department of Physics, Kyoto University AND KEN'ICHI NOMOTO Department of Earth Science and Astronomy, University of Tokyo Received 1988 October 26; accepted 1989 February 1 ABSTRACT Formation of dust grains in the ejecta of SN 1987A is investigated on the basis of a theory of homogeneous nucleation and grain growth. We consider the formation of dust grains in the gas ejected from a heavy element-rich mantle and discuss the effects of latent heat released during grain growth and of radiation from the photosphere. The results of the calculations are as follows: Dust grains can condense in the heavy element-rich mantle and the time of formation strongly depends on the temperature structure in the ejecta. Moreover, the formation of dust grains is retarded by the strong radiation field of the supernova and the effect of latent heat deposited during grain growth. In a model of the ejecta without mixing, where the composition structure is onion-like, graphite grains condense first. On the other hand, if the ejecta is mixed from the center to the outer edge of the He layer as suggested from the observations of X-rays and {gamma}-rays, oxidic grains such as Al_2_O_3_, Mg_2_SiO_4_, and Fe_3_O_4_ condense; graphite grains may form depending on how many CO molecules are formed in the ejecta. Subject headings: interstellar: grains - stars: individual (SN 1987A) - stars: supernovae
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