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Dust Signatures from Late-time Infrared and Optical Observations of SN 1998S
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2005 (English)In: 1604-2004: Supernovae as Cosmological Lighthouses: ASP Conference Series, Vol. 342, Proceedings of the conference held 15-19 June, 2004 in Padua, Italy, San Francisco: Astronomical Society of the Pacific , 2005, Vol. 342, 337- p.Conference paper (Refereed)
Abstract [en]

We present late-time IR (1-5 µm) and optical observations of the type IIn SN 1998S up to about 1200 days post-explosion. The shape and evolution of the Hα and He I 1.083 µm line profiles indicate a powerful interaction with a massive progenitor wind and provide evidence of dust condensation within the ejecta. 1.5-2.5 µm spectra and HKL'M' photometry reveal strong IR emission due to hot dust in the ejecta and/or circumstellar medium (CSM). For the origin of the IR emission we favour dust condensation (at least 10^{-3} M_{sun}) in a cool dense shell (CDS) as the main IR source but do not rule out a contribution from the CSM. The late-time evolution of the intrinsic (K-L') colour of type II supernovae (SNe) may be a potentially useful tool for determining the presence or absence of a massive CSM around their progenitors.

Place, publisher, year, edition, pages
San Francisco: Astronomical Society of the Pacific , 2005. Vol. 342, 337- p.
, ASP Conference Series, 342
Research subject
URN: urn:nbn:se:su:diva-30939OAI: diva2:274778
Available from: 2009-11-01 Created: 2009-11-01 Last updated: 2011-02-15Bibliographically approved

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Lundqvist, P.Sollerman, J.
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Department of Astronomy

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