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SALT spectroscopic classification of SN 2017lm (= ATLAS17aix) as a type-Ia supernova near maximum light

ATel #9981; S. W. Jha, K. Dettman (Rutgers), Y.-C. Pan, R. J. Foley (UCSC), A. Rest (STScI), D. Scolnic (Chicago/KICP), R. Kuhn (SALT/SAAO)
on 20 Jan 2017; 19:10 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 SN 2017lm (= ATLAS17aix) on 2017 Jan 19.8 UT, covering the wavelength range 350-930 nm. The longslit was also placed through the host galaxy nucleus, and numerous emission lines yield a host redshift z = 0.03052. Cross-correlation of the supernova spectrum with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows SN 2017lm is a type-Ia supernova near maximum light. A good SNID match is obtained with SN 2005na at -2 days. The expansion velocity for SN 2017lm, measured to the trough of the Si II (rest 635.5 nm) line, is 10,900 km/s.

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