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SALT spectroscopic classification of PS16eho (= SN 2016gcr) as a type-Ia supernova after maximum light

ATel #9491; S. W. Jha, K. Dettman (Rutgers), Y.-C. Pan, R. J. Foley (UCSC), A. Rest (STScI), D. Scolnic (Chicago/KICP), M. Kotze (SAAO/SALT)
on 13 Sep 2016; 09:28 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 PS16eho (= SN 2016gcr) on 2016 Sep 12.0 UT, covering the wavelength range 350-930 nm. The spectrum is significantly contaminated with host galaxy light, and we confirm the redshift of the host galaxy 2MASX J22321713-2342106 z = 0.065 (Colless et al. 2003, 2dFGRS, arXiv:astroph/0306581; via NED) with numerous absorption and emission lines.

Cross-correlation of the spectrum with a supernova template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows PS16eho is a type-Ia supernova approximately two weeks past maximum light. A good SNID match is obtained with SN 2005hf at +12 days. SNID matches to post-maximum SN Ic spectra are plausible, but not as compelling.

Our spectrum is posted on the Transient Name Server SN 2016gcr page.

PS16eho 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/