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Classification of PSN J13075109-0052004 as a pre-max Type Ia SN with WiFeS

ATel #5238; M. Childress, R. Scalzo, B. Tucker, F. Yuan, B. Schmidt (Australian National University)
on 31 Jul 2013; 10:34 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 PSN J13075109-0052004 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). PSN J13075109-0052004 was discovered by Stu Parker on 2013 July 29 at mag 17.4. A 40 minute WiFeS spectrum of the SN on 2013 July 31 indicates this is a Type Ia supernova a few days before maximum light. Evident lines include Si II 6355, the Ca II NIR triplet, the "sulfur W", and Ca II H&K. Classification with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) shows best match to SN 2005cf at -4 days, at a redshift of 0.016 +- 0.005, consistent with the redshift of the apparent host galaxy IC 850 (z=0.018052 - Grogin, Geller, & Huchra, 1998, ApJS, 119, 277 - via NED). Given the nominal redshift of the host, we estimate the Si II 6355 velocity to be about 10,900 km/s.

 
 Name                   | RA (J2000)   | Dec (J2000)  | Disc. Date | Disc. Source    | Disc Mag  |   z   |  Type |  Phase       | Notes 
 PSN J13075109-0052004  | 13 07 51.09  | -00 52 00.4  |  20130729  | Parker          |    17.4   | 0.016 |  Ia   |  -4          |