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2010MNRAS.403..474W - Mon. Not. R. Astron. Soc., 403, 474-482 (2010/March-3)
The destruction and survival of dust in the shell around SN2008S.
WESSON R., BARLOW M.J., ERCOLANO B., ANDREWS J.E., CLAYTON G.C., FABBRI J., GALLAGHER J.S., MEIXNER M., SUGERMAN B.E.K., WELCH D.L. and STOCK D.J.
Abstract (from CDS):
We have constructed radiative transfer dust models for the object before and after the outburst, using the same r–2 density distribution of pre-existing amorphous carbon grains for all epochs and taking light travel time effects into account. We rule out silicate grains as a significant component of the dust around SN 2008S. The inner radius of the dust shell moved outwards from its pre-outburst value of 85 au to a post-outburst value of 1250 au, attributable to grain vaporization by the light flash from SN 2008S. Although this caused the circumstellar extinction to decrease from AV = 15 before the outburst to 0.8 after the outburst, we estimate that less than 2 per cent of the overall circumstellar dust mass was destroyed.
The total mass-loss rate from the progenitor star is estimated to have been 0.5-1.0 x10–4M☉/yr. The derived dust-mass-loss rate of 5x10–7M☉/yr implies a total dust injection into the interstellar medium of up to 0.01M☉ over the suggested duration of the self-obscured phase. We consider the potential contribution of objects like SN 2008S to the dust enrichment of galaxies.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): circumstellar matter - Supernovae: individual: SN2008S
Simbad objects: 15
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