Spectroscopic Classification of Optical Transients with SOAR/Goodman
ATel #15498; K. W. Davis, R. J. Foley (UCSC), G. Dimitriadis (TCD), K. de Soto (PSU)
on 4 Jul 2022; 23:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)
Subjects: Optical, Supernovae, Transient
We report the classification of AT2022ljr, AT2022nll, and AT2022oao from spectroscopic observations with the the Goodman spectrograph on the Southern Astrophysical Research (SOAR) telescope, made on 2022 July 3 UT. They were supplied by ZTF, YSE, and ATLAS respectively. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ZTF22aalzjdc | AT2022ljr | 15:43:02.080 | +18:04:35.98 | 0.20 | SLSN-I | +20d | (1)
PS22fpi | AT2022nll | 12:41:36.136 | -03:42:39.57 | 0.0585 | | | (2)
ATLAS22skm | AT2022oao | 13:14:39.444 | +21:39:14.48 | 0.0497 | Ia | -10d | (3)
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 find good matches to PTF09cnd and other SLSNe-I. The transient peaked at m ~ 19 mag, corresponding to M ~ -21.1 mag at z = 0.20, similar to SLSN peak luminosities.
(2) The spectrum is blue and relatively featureless. We detect narrow H beta at the host-galaxy redshift.
(3) We measure a Si II 6355 velocity of -16,400 km/s.
