Spectroscopic Classifications of Optical Transients with Keck I + LRIS

ATel #15019; K. Taggart, S. Tinyanont, K. W. Davis, R. J. Foley (UCSC)
on 6 Nov 2021; 17:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)

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We report the following classifications from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Nov 6 UT. The targets were supplied by ALeRCE (selected from the ZTF data stream) and the Young Supernova Experiment. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name | RA (J2000)  | Dec (J2000) |   z    | Type | Phase | Notes 
PS21lic     | 2021abwm | 08:22:09.57 | +49:00:00.35|	0.094  | Ia   |  +10  | (1) 
PS21ljm     | 2021accm | 21:17:06.31 | -00:42:11.72| 0.061  | Ib   | +0    | (2) 
PS21lkn     | 2021aceh | 22:14:05.18 | +06:49:28.41|	0.047  | II   | +10   | (3) 
ZTF21acimecy| 2021acgo | 00:30:07.60 | +16:09:46.37|	0.10   | Ia   | +8    | (4) 
ZTF21acizbmv| 2021acgu | 02:41:13.06 | +00:32:53.82|	0.129  | Ia   | +8    | (5) 
PS21lku     | 2021acfj | 02:25:22.64 | -07:50:26.97| 0.054  | Ib   | +21   | (6) 
PS21lmr     | 2021achy | 21:59:28.16 | +02:38:38.30|	0.08   | II   |       | (7) 
PS21ltx     | 2021acza | 23:49:08.85 | +24:41:03.24|	0.190  | Ia   | -4    | (8) 
PS21lub     | 2021aczd | 08:48:53.07 | +49:20:58.29|	0.138  | Ia   | -2    | (9) 
PS21lvt     | 2021adnv | 03:26:31.03 | -02:07:14.52|	0.19   | Ia   | +5    | (10) 
PS21lvu     | 2021adnw | 04:08:33.42 | -12:34:43.86|	0.09   | II   |       | (11) 
ZTF21ackmlae| 2021adew | 20:39:06.85 | +00:02:51.09| 0.078  | Ia   | -6    | (12) 
ZTF21aclyxes| 2021adly | 11:28:41.81 | +35:06:45.50| 0.042  | SN   |       | (13) 

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) We measure an Si II 6355 velocity of -11,900 km/s. (2) We measure an He I 5876 velocity of -10,900 km/s. (3) We measure an H-alpha absorption velocity of -10,100 km/s. (4) We measure an Si II 6355 velocity of -11,700 km/s. (5) We measure an Si II 6355 velocity of -10,500 km/s. (6) Classified as SN on TNS. We refine classification as a Ib. (7) Blue spectrum indicating an early phase. We measure an H-alpha absorption velocity of -8,900 km/s. (8) We measure an Si II 6355 velocity of -10,000 km/s. (9) We measure an Si II 6355 velocity of -11,400 km/s. (10) We measure an Si II 6355 velocity of -9,200 km/s. (11) We measure an H-alpha absorption velocity of -11,900 km/s. (12) We measure an Si II 6355 velocity of -11,200 km/s. (13) Blue continuum with faint emission features consistent with He II 4686 and N III and/or N V.