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Spectroscopic Classifications of Optical Transients with Keck I/LRIS

ATel #10976; R. J. Foley, D. O. Jones, M. R. Siebert (UCSC)
on 16 Nov 2017; 17:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)

Subjects: Optical, Supernovae

We report the following classifications of optical transients from spectroscopic observations with LRIS on the Keck I 10-m telescope. Targets were supplied by the ASAS-SN and ATLAS. All observations were made on 2017 Nov 16 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type | Phase | Notes
ATLAS17nbg | AT2017hyi | 07:20:27.80 | +56:08:07.23 | 0.037 | Ia | -2 d | a ATLAS17ncv | AT2017hzi | 06:47:47.15 | +31:20:13.12 | 0.017 | II | | b ASASSN-17ow | AT2017hzw | 02:05:18.13 | +53:12:13.43 | 0.051 | Ia-CSM | | c ATLAS17nef | AT2017ifb | 23:43:01.24 | +18:59:40.41 | 0.072 | Ia | -4 d | d

Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (a) We measure a velocity of -12,400 km/s for Si II 6355. (b) We measure a velocity of -10,300 km/s for H alpha. (c) We measure a FWHM of ~2000 km/s for H alpha. (d) We detect a relatively strong Na D line with an EW of 2.1 A. We measure a velocity of -12,800 km/s for Si II 6355.