Spectroscopic Classification of optical transients with the Keck II telescope
ATel #16161; K. Taggart, K. W. Davis, R. J. Foley (UCSC)
on 28 Jul 2023; 17:01 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Kirsty Taggart (k.taggart@ucsc.edu)
Subjects: Optical, Supernovae
We report the following classification from a spectroscopic observation with the ESI spectrograph on the Keck II telescope. The targets were supplied by the Young Supernova Experiment, ATLAS, GOTO, and ZTF. The observations were made on 2023 Jul 23 UT. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name| RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS23gxy | 2023enz | 21:13:06.10 | -01:22:43.12 | 0.04689 | SN | post-peak |
PS23dyr | 2023kcc | 22:41:51.42 | +24:25:10.54 | 0.06427 | Ibc | post-peak |
ZTF23aansdlc | 2023kqw | 14:36:43.33 | +12:05:24.27 | 0.05466 | IIn | post-peak | (1)
PS23elg | 2023lcs | 14:11:19.45 | -05:04:49.28 | 0.0467 | II | post-peak | (2)
GOTO23mh | 2023lkm | 22:41:46.80 | +36:06:29.63 | 0.02469 | Ib/c | post-peak | (3)
ZTF23aaqjumr | 2023mim | 14:07:58.22 | +05:29:12.44 | 0.086151| Ia | +10 | (4)
ZTF23aaquolj | 2023mpu | 23:51:59.50 | +33:48:51.82 | 0.04206 | IIn | peak | (5)
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) The likely host galaxy is a faint blue dwarf galaxy (Mr ~ -16 mag). We measure the narrow H-alpha P Cygni lines to have a velocity of -300 km/s.
2) We measure an H-alpha absorption velocity of -6,500 km/s.
3) Classified as Type I according to TNS; we reclassify as a SN Ib/c.
4) We measure a Si II 6355 absorption velocity of -12,500 km/s.
5) We measure an H-alpha FWHM of 3,300 km/s using a Lorentzian profile fit.
