Probing Complex Circumstellar Material in SNe: Monitoring SN1996cr and SN1978K

Details Probing Complex Circumstellar Material in SNe: Monitoring SN1996cr and SN1978K Probing Complex Circumstellar Material in SNe: Monitoring SN1996cr and SN1978K

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1885b&link_type=abstract

ATNF proposal C184, Semester: October, 2008

Physics

Extragalactic, Atca

Scientific paper

Following the recent discovery of SN1996cr, we propose ATCA monitoring to constrain its late-time evolution. SN1996cr was initially undetected at radio and X-ray wavelengths, but rapidly rose 2 yrs after the explosion (similar to SN1987A, although 1000x more luminous) and has remained constant for 8 yrs. This evolution implies that SN1996cr exploded into a wind-blown bubble formed by the progenitor, with the blast-wave still propagating through a dense, wind-swept shell. Once this region is overtaken, we expect SN1996cr's flux to decline rapidly. The proposed monitoring will set constraints on the thickness and density of the wind-swept shell, place limits on inhomogeneities within the shell itself, and augment our ongoing VLBI and X-ray follow-up programs. We additionally propose more frequent monitoring of SN1978K, a SNe which could be an older version of SN1996cr. The fact that several (e.g., SN1987A, SN1996cr, and perhaps SN1978K) of the nearest recent SNe show evidence for wind-blown bubbles implies that such SNe may be common. Thus obtaining constraints on bright targets like these will help mould our understanding and interpretation of more distant sources for years to come.

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