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Classification of PSN J14244257-0312309 as an Old Type II Supernova

ATel #4890; M. Childress, R. Scalzo, F. Yuan, B. Tucker, B. Schmidt (Australian National University)
on 15 Mar 2013; 03:54 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michael Childress (mjc@mso.anu.edu.au)

Subjects: Optical, Supernovae

We report spectroscopic classification of the supernova candidate PSN J14244257-0312309 as an old Type II SN. We obtained a 20-minute spectrum of PSN J14244257-0312309 on 2013 March 14.72 with the Wide Field Spectrograph (WiFeS - Dopita et al., 2007, ApSS, 310, 255) on the ANU 2.3m telescope at Siding Spring Observatory, NSW Australia, using the B3000/R3000 gratings (3500-9800 A, 1 A resolution). The object spectrum was compared to supernova spectral templates using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024), and the top matches were consistently Type IIP SNe at ages of 2-3 months with mean redshift of z=0.008+-0.003, consistent with the redshift of the apparent host galaxy NGC 5604 of 0.009166 (Theureau et al., 1998, A&AS, 130, 333 -- via NED). The SN has a cool spectrum characterized by broad P-cygni Halpha emission with an absorption mininum at 7700 km/s, and photospheric velocity of 3500 km/s as measured from Fe II 5018. The spectrum is consistent with a typical type IIP SN at the end of the plateau phase.