Spectroscopic Classifications of Optical Transients with Keck I + LRIS

ATel #14024; G. Dimitriadis, M. R. Siebert, K. Taggart , S. Tinyanont, R. J. Foley (UCSC)
on 17 Sep 2020; 18:24 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Georgios Dimitriadis (gdimitri@ucsc.edu)

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We report the classification of the optical transients from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2020 Sep 17 UT. The targets were supplied by YSE, ZTF and ATLAS. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name  | RA (J2000)  |  Dec (J2000)  |   z   |  Type   |   Phase   | Notes
 
PS20gio      | AT2020qlq | 22:14:55.09 | +31:46:40.98  | 0.039 |   Ib/c  | post-peak | 
ATLAS20ygl   | AT2020ryb | 15:09:16.68 | +09:48:46.23  | 0.082 |   Ia    |   +25d    |  (1) 
ATLAS20yhl   | AT2020ryn | 14:57:24.85 | -03:07:35.26  | 0.073 |   Ia    |   +20d    |  (2) 
ZTF20abwdwoa | AT2020scj | 00:04:30.24 | +17:32:34.48  | 0.103 |   Ia    |   +9d     |  (3) 
ZTF20abxjefm | AT2020sga | 21:23:36.31 | +13:49:02.98  | 0.079 |   Ia    |   +8d     |  (4) 
ZTF20abxidyb | AT2020sia | 00:20:40.58 | +28:49:21.61  | 0.099 |   Ia    |   +5d     |  (5) 
ZTF20abyfmjr | AT2020skr | 02:42:45.17 | +38:05:01.36  | 0.099 |   Ia    |   +3d     |  (6) 
ATLAS20zbm   | AT2020spq | 06:45:45.65 | -31:14:05.64  | 0.013 |   Ia    |   +1d     |  (7) 
ATLAS20zmk   | AT2020sym | 01:29:00.70 | -19:06:32.14  | 0.042 |   Ic    |   peak    | 
ATLAS20zyk   | AT2020teb | 03:05:47.28 | -00:09:41.52  | 0.104 |   Ia    |   +10d    |  (8) 
ATLAS20babv  | AT2020tfc | 22:17:00.81 | +30:39:21.14  | 0.038 |   Ia    |   -7d     |  (9) 
PS20hlf      | AT2020tht | 01:10:54.44 | -18:57:50.25  | 0.053 |   Ia    |   -5d     |  (10) 
PS20hlj      | AT2020thx | 01:29:08.37 | -14:47:38.32  | 0.084 |   SN    |   young   |  (11) 
ZTF20abyrmdl | AT2020tkc | 00:06:35.08 | +28:18:33.76  | 0.036 |   IIb   |   peak    | 
ATLAS20bbft  | AT2020tlf | 14:40:10.03 | +42:46:39.64  | 0.008 |   II(n) |   young   |  (12) 

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) Significant host galaxy extinction (Na I D EW = 3.82 Angstrom). (2) We measure an Si II velocity of -9,400 km/s. (3) Good matches with various 91T-like SNe Ia. We measure an Si II velocity of -8,200 km/s and a Na I D EW of 1.81 Angstrom. (4) Good matches with various 91T-like SNe Ia. We measure an Si II velocity of -9,300 km/s. (5) We measure an Si II velocity of -10,000 km/s. (6) We measure an Si II velocity of -10,000 km/s and a Na I D EW of 1.29 Angstrom. (7) We measure an Si II velocity of -10,100 km/s. (8) We measure an Si II velocity of -10,400 km/s. (9) Significant host galaxy extinction (Na I D EW = 2.12 Angstrom). We measure an Si II velocity of -14,400 km/s. (10) Significant host galaxy extinction (Na I D EW = 2.87 Angstrom). We measure an Si II velocity of -11,900 km/s. (11) Blue continuum. (12) Blue transient with several flash ionization features. We measure an Halpha FWHM of 2,000 km/s.