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SN 1978K: The first millimetre detection of an evolved supernova outside of our Local Group | | S. D. Ryder
; R. Kotak
; I. A. Smith
; S. J. Tingay
; E. C. Kool
; J. Polshaw
; | | Date: |
11 Oct 2016 | | Abstract: | Supernova 1978K is one of the oldest-known examples of the class of Type IIn
supernovae that show evidence for strong interaction between the blast wave and
a dense, pre-existing circumstellar medium. Here we report detections of SN
1978K at both 34 GHz and 94 GHz, making it only the second extragalactic
supernova after SN 1987A to be detected at late-times at these frequencies. We
find SN 1978K to be >400 times more luminous than SN 1987A at millimetre
wavelengths in spite of the roughly nine year difference in ages, highlighting
the risk in adopting SN 1987A as a template for the evolution of core-collapse
supernovae in general. Additionally, from new VLBI observations at 8.4 GHz, we
measure a deconvolved diameter for SN 1978K of ~5 milli-arcsec, and a
corresponding average expansion velocity of <1500 km/s. These observations
provide independent evidence of an extremely dense circumstellar medium
surrounding the progenitor star. | | Source: | arXiv, 1610.3149 | | Services: | Forum | Review | PDF | Favorites | |
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