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SALT spectroscopic classification of DLT17ar (= SN 2017cyy) as a type-Ia supernova before maximum light

ATel #10261; S. W. Jha (Rutgers), D. Sand (TTU), L. Tartaglia (TTU, UC Davis), S. Valenti (UC Davis), R. Kuhn (SALT/SAAO)
on 12 Apr 2017; 22:10 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Saurabh Jha (saurabh@physics.rutgers.edu)

Subjects: Supernovae

We obtained SALT (+RSS) spectroscopy of DLT17ar (= SN 2017cyy) on 2017 Apr 12.8 UT, covering the wavelength range 350-725 nm under cloudy conditions. Cross-correlation of the noisy supernova spectrum with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows DLT17ar is a type-Ia supernova before maximum light. A good SNID match is obtained with SN 2007bd at -8 days. Adopting a redshift z = 0.0098 for the host galaxy ESO 091-G015 (from the HIPASS catalog, Meyer et al. 2004, MNRAS, 350, 1195; via NED), the expansion velocity for DLT17ar, measured to the trough of the Si II (rest 635.5 nm) line, is 15,800 km/s.

Our spectrum is posted on the Transient Name Server SN 2017cyy page.