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Spectroscopic classification of AT 2017cfd as a young Type Ia supernova

ATel #10182; J. Vinko (Konkoly Obs; U Szeged; UT Austin), J. C. Wheeler (UT Austin)
on 18 Mar 2017; 18:30 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)

Subjects: Optical, Supernovae

We report the spectroscopic observation of AT 2017cfd, a transient discovered by the Lick Observatory Supernova Search (LOSS) on 2017-03-16.

A spectrum (range 3700-9300 Angstroms), taken with the new "Low Resolution Spectrograph-2" (LRS2) on the 10m Hobby-Eberly Telescope at McDonald Observatory by Steve Odewahn on 2017-03-18.16 UT, is similar to that of a Type Ia supernova before maximum light.

A comparison with supernova templates using the "Supernova Identification" code (SNID; Blondin \& Tonry, 2007, ApJ 666, 1024) resulted in a good match with many Type Ia template spectra with a median age of -1 +/- 5 days. The redshift estimated by SNID from the SN features is consistent with that of the host galaxy, IC 0511 (z=0.012 from NED). The photospheric expansion velocity derived from the SiII 6355 A feature is about 13,700 km/s.