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SALT spectroscopic classification of PS15bjg as a type-Ia supernova

ATel #7846; S. W. Jha (Rutgers), Y.-C. Pan, R. J. Foley (Illinois), A. Rest (STScI), D. Scolnic (Chicago/KICP), K. W. Smith, D. Wright, S. J. Smartt (QUB), M. Huber, K. C. Chambers, H. Flewelling, M. Willman, N. Primak, A. Schultz, B. Gibson, E. Magnier, C. Waters, J. Tonry, R. J. Wainscoat (IfA, Hawaii), E. Romero Colmenero (SALT/SAAO)
on 27 Jul 2015; 20:10 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Saurabh Jha (saurabh@physics.rutgers.edu)

Subjects: Optical, Supernovae

We obtained SALT (+RSS) spectroscopy of PS15bjg on 2015 July 27.0 UT, covering the wavelength range 350-900 nm. Cross-correlation of the spectrum with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows PS15bjg to be a normal type-Ia supernova several days before maximum light. The supernova host galaxy, 2MASX J22551005-0024333, has a redshift z = 0.069 (from 6dFGS, Jones et al. 2009, MNRAS, 399, 683, via NED; and from SDSS) and is the brightest cluster galaxy (BCG) of the cluster SDSS-C4 2072 (Miller et al. 2005, AJ, 130, 968). Adopting this redshift yields an expansion velocity for the supernova of 13,100 km/s, measured using the Si II (rest 635.5 nm) feature.

PS15bjg was discovered as part of the Pan-STARRS Survey for Transients (Huber et al. 2015, ATel #7153). Information on all PSST objects is available at http://star.pst.qub.ac.uk/ps1threepi/