Spectroscopic Classifications of Optical Transients with the Lick Shane telescope

ATel #13366; G. Dimitriadis, R. J. Foley (UCSC)
on 23 Dec 2019; 22:24 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Georgios Dimitriadis (gdimitri@ucsc.edu)

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We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. Targets were supplied by ASASSN, ATLAS, Gaia and ZTF (both self-reported and by ALeRCE). All observations were made on 2019 Dec 23 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name  | RA (J2000)  | Dec (J2000)  |   z   | Type  | Phase  | Notes
 
ZTF18aacemcn | AT2019wmr | 09:46:03.55 | +33:31:41.66 | 0.038 |  II   |        |  (1) 
ZTF19acymzwh | AT2019wqf | 14:30:00.14 | +39:56:44.94 | 0.033 |  Ia   |  +7 d  |  (2) 
Gaia19fnz    | AT2019wqz | 11:47:18.35 | -29:11:19.54 | 0.032 |  Ia   |  -2 d  |  (3) 
ASASSN-19adg | AT2019wrz | 12:03:07.02 | +20:48:21.85 | 0.024 |  Ia   |  +5 d  |  (4) 
ZTF19acytidb | AT2019wwh | 11:39:48.30 | +23:31:56.50 | 0.031 |  Ia   |  -5 d  |  (5) 
ATLAS19bdir  | AT2019xdf | 09:27:51.81 | +68:24:42.44 | 0.013 |       |        |  (6) 

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. (1) SN candidate identified by ALeRCE using the public ZTF stream. We measure an H-alpha velocity of -10,100 km/s. (2) SN candidate identified by ALeRCE using the public ZTF stream. We measure an Si II 6355 velocity of -9,500 km/s. (3) We measure an Si II 6355 velocity of -10,400 km/s. (4) Reddened spectrum (NaID doublet EW ~ 2.1 Angstrom), indicating significant dust extinction. We find good fits to Type Ia supernovae a few days after maximum light. We measure an Si II 6355 velocity of -10,700 km/s. (5) Reddened spectrum, with a strong NaID doublet (EW ~ 2.8 Angstrom), indicating significant dust extinction. We find good fits with 91T-like SNe Ia spectra a few days before maximum light. We measure an Si II 6355 velocity of -9,200 km/s. (6) The spectrum contains a blue, featureless continuum.