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Freeze out, IR-catastrophes and Non-thermal Emission in SNe

Published online by Cambridge University Press:  12 April 2016

Claes Fransson ,
John Houck  and
Cecilia Kozma
Claes Fransson
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
John Houck
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
Cecilia Kozma
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden

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Freeze out effects and the IR-catastrophe are discussed for SN 1987A and for Type la SNe. We show that the light curves of the optical lines in SN 1987A provide strong evidence for the IR-catastrophe. We also argue that most optical lines are dominated by non-thermal excitation after ∼ 800 days. The level of this emission is set mainly by the total mass of the elements. Models of the [OI]λλ6300 — 64 light curve show that an oxygen mass of ∼ 1.5Mʘ is needed. Light curve models for Type la SNe display a sharp decrease in the optical flux as a result of the IR-catastrophe at ∼ 500 days, producing UBV-photometry inconsistent with observations of SN1972E by Kirshner & Oke (1975).

Type
SN 1987A, SN 1993J, and Other Supernovae
Information
International Astronomical Union Colloquium , Volume 145: Supernovae and Supernova Remnants , 1996 , pp. 211 - 222
Copyright
Copyright © Cambridge University Press 1996

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