SCAT classification of optical transients
ATel #12391; M A Tucker, A V Payne, A Do, B J Shappee, M E Huber (IfA), J Strader (MSU), K Z Stanek (OSU)
on 15 Jan 2019; 06:49 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michael Tucker (tuckerma95@gmail.com)
Subjects: Optical, Cataclysmic Variable, Supernovae, Transient
The Spectral Classification of Astronomical Transients (SCAT) survey (ATel #11444) presents the classification of 14 optical transients. We report optical spectroscopy (330-970nm) taken with the University of Hawaii 88-inch (UH88) telescope using the SuperNova Integral Field Spectrograph (SNIFS). Transients were classified using the SuperNova IDentification code (SNID, Blondin & Tonry 2007, ApJ, 666, 1024). Targets are chosen from TNS transient reports, and data from Lasair (https://lasair.roe.ac.uk/) was used when available. Redshifts given to 2 decimal places are derived with SNID, otherwise NED or host emission lines are used. All spectra are made publicly available via TNS.
Survey Name IAU Name Date Obs. Disc ATel. Type Phase Redshift Notes
ASASSN-18acl 2018lei 2018-12-31 ATel #12348 Ic-norm -1 (5) 0.006 (1)
ZTF19aacqeai 2019ri 2019-01-12 ... Ia-norm +2 (6) 0.04
ZTF19aacsofi 2019oc 2019-01-12 ... Ia-norm -2 (4) 0.07
ATLAS19awx 2019on 2019-01-12 ... Ia-norm -2 (5) 0.03 (2)
ATLAS19awz 2019oo 2019-01-12 ... CV/Stellar ... 0 (3)
ZTF19aacijie 2019qb 2019-01-12 --- Ia-norm +0 (5) 0.06
ZTF18aacdbzx 2019qg 2019-01-12 ... Ic-broad +15(10) 0.080
ZTF19aaafgbt 2019qj 2019-01-12 ... Ia-norm -3 (3) 0.120
ZTF19aadgimr 2019qt 2019-01-12 ... IIn post-max? 0.035 (4)
ZTF19aaaheft 2019is 2019-01-13 ... CV ... 0 (5)
ZTF19aaaajtq 2019ir 2019-01-13 --- Ia-norm +0 (4) 0.07
ZTF18adcbyiw 2019gj 2019-01-13 ... Ia-norm +3 (2) 0.08
ATLAS19bdu 2019rn 2019-01-13 ATel# 12384 IIb -5 (3) 0.013 (1)
ATLAS19axa 2019op 2019-01-13 ... Ia-91bg +1 (5) 0.04
1) Significant host emission in the reduced spectrum.
2) Already classified on TNS by Prentice et al. (TNS CRN 3402).
3) Noisy blue spectrum with weak Balmer emission and CaII H aand K in absorption at z=0, yet no obvious HeI or HeII lines. SDSS has a faint object at the same location (r ~ 23.5 mag), and compared to the ATLAS discovery mag indicates a ~3.5 mag outburst. We consider this a likely CV, although other stellar variability cannot be concretely ruled out.
4) Blue spectrum with strong Balmer and weaker HeI emission. Inconsistent with the host galaxy center, so not an AGN. However, likely host galaxy contributions in the reduced spectrum make phase determination difficult. Based on the amount of host galaxy contribution or lack thereof, SNID finds matches to SNe IIn templates from -10 days (SN1998S) to +60 days (SN1996L), so we conclude the true phase is likely somewhere after maximum light.
5) Noisy blue spectrum showing CaII H (3969A) and Hbeta absorption, Halpha in emission, and HeI absorption with emission cores at z~0. The PanSTARRS Stack Object Catalog has a faint object (g ~ 22.7 mag) at the source position, and comparison to Lasair photometry indicates an outburst of > ~6.6 mag.
