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Recent developments in supernova research with VLBI

Published online by Cambridge University Press:  29 January 2014

Norbert Bartel  and
Michael F. Bietenholz
Norbert Bartel
Affiliation:
York University, Toronto, M3J 1P3Canada email: [email protected]
Michael F. Bietenholz
Affiliation:
York University, Toronto, M3J 1P3Canada email: [email protected] Hartebeesthoek Radio Observatory, PO Box 443, Krugersdrop 1740, South Africa email: [email protected]
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Abstract

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Very long baseline interferometry (VLBI) observations during the last 30 years have resolved many supernovae and provided detailed measurements of the expansion velocity and deceleration. Such measurements are useful for estimating the radial density profiles of both the ejecta and the circumstellar medium left over from the progenitor. VLBI measurements are also the most direct way of confirming the relativistic expansion velocities thought to occur in supernovae associated with gamma-ray bursts. Well-resolved images of a few supernovae have been obtained, and the interaction of the ejecta as it expands into the circumstellar medium could be monitored in detail. We discuss recent results, for SN 1979C, SN 1986J, and SN 1993J, and note that updated movies of the latter two of the supernovae from soon after the explosion to the present are available from the first author's personal website.

Keywords

techniques: high angular resolutionradio continuum: starssupernovae: generalsupernovae: individual (SN 1979C, SN 1986J, SN 1993J)stars: mass lossstars: neutrongalaxies: distances and redshifts
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 53 - 57
Copyright
Copyright © International Astronomical Union 2014 

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