Physics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2354b&link_type=abstract
ATNF proposal C184, Semester: April, 2009
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) and has remained constant for >7 yrs [>1000 L(1987A)] before showing a 20% decline in the last ~2 yrs. This evolution implies that SN1996cr exploded into a wind-blown bubble formed by the progenitor, where the blast-wave appears to be emerging from a dense shell of wind-swept material it had long been propagating through. We expect its flux to decline rapidly, and thus would like to continue our bi-monthly monitoring efforts. The proposed radio observations for SN1996cr 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. While SN1996cr is still bright, it would additionally make an excellent target for HI absorption studies of the surrounding circumstellar material and host galaxy disk, provided that the new CABB system is available for testing.
Bauer Franz
Dwarkadas Vikram
Emonts Bjorn
Ryder Stuart
Stockdale Christopher
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