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SALT spectroscopic classification of LSQ16acz (= PS16bby = SN 2016bew) as a type-Ia supernova approaching maximum light

ATel #8829; S. W. Jha (Rutgers), Y.-C. Pan, R. J. Foley (Illinois), A. Rest (STScI), D. Scolnic (Chicago/KICP), M. Kotze (SAAO/SALT)
on 16 Mar 2016; 16:22 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 LSQ16acz (= PS16bby = SN 2016bew; Baltay et al. 2013, PASP, 125, 683) on 2016 Mar 14.9 UT, covering the wavelength range 340-920 nm. Cross-correlation of the spectrum with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows LSQ16acz is a type-Ia supernova a few days before maximum light. The redshift of the supernova matches a nearby galaxy (the putative host, though offset by approximately 15 arcsec). Our SALT observation put this galaxy on the longslit, and its spectrum yields z = 0.0540 +/- 0.0001, close to the redshift reported by 6dF (z = 0.0534 +/- 0.0001; Jones et al. 2004, MNRAS, 355, 747; Jones et al. 2009, MNRAS, 399, 683; via NED). The expansion velocity of the supernova, measured to the trough of the Si II (rest 635.5 nm) line is 11,000 km/s.

Our spectra of the supernova and the host are posted on the Transient Name Server SN 2016bew page.

LSQ16acz (= PS16bby) was independently 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/