SCAT classification of optical transients
ATel #12290; A. Do, M. A. Tucker, A. V. Payne, M. E. Huber, B. J. Shappee (IfA, UH Manoa), J. Prieto (MAS), K. Z. Stanek (OSU)
on 13 Dec 2018; 08:22 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michael Tucker (tuckerma95@gmail.com)
Subjects: Optical, Cataclysmic Variable, Star, Supernovae, Transient
The Spectral Classification of Astronomical Transients (SCAT) survey (ATel #11444) presents the classification of 17 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, Lanz et al. 2005). Transients were classified using the SuperNova IDentification code (SNID, Blondin & Tonry 2007, ApJ, 666, 1024).
Survey Name IAU Name Date Obs. Disc ATel. Type Phase Redshift Notes
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ASASSN-18aar SN2018jgn 2018-12-03 --- Ia-norm -2 (1) 0.067 (NED) (1,2)
GSNST 2018-al AT2018jgb 2018-12-03 --- unconfirmed --- --- (1,3)
ATLAS18znm SN2018jdn 2018-12-03 --- Ia-norm +5 (2) 0.08 (SNID) (1)
--- SN2018jag 2018-12-03 --- Ia-norm 0 (5) 0.040 (NED) (1,4)
ATLAS18zpz SN2018jha 2018-12-03 --- Ia-norm +5 (3) 0.086 (NED) (1)
Gaia18dpp SN2018jhb 2018-12-03 --- Ia-norm +3 (2) 0.072 (NED)
ASASSN-18aah SN2018jdq 2018-12-03 ATel#12249 Ia-norm +2 (2) 0.028 (host)
ATLAS18zob SN2018jfu 2018-12-03 --- Ib-norm 0 (5) 0.029 (NED) (1)
ZTF18acrtvmm SN2018jfp 2018-12-03 --- Young II? --- 0.023 (NED) (5)
ZTF17aacwaxc AT2018jkw 2018-12-11 --- M dwarf --- --- (6)
ATLAS18bbhc SN2018jpi 2018-12-11 --- SN ? < 0.1 (SNID) (7)
ATLAS18zvk AT2018jlv 2018-12-11 --- CV? --- --- (8)
ZTF18actbevv AT2018jpx 2018-12-11 --- M dwarf --- --- (9)
ATLAS18bafx SN2018jly 2018-12-11 --- Ia-norm +11(2) 0.034 (NED)
ZTF18acrgunw SN2018joe 2018-12-11 --- Ia-norm 0 (5) 0.065 (NED)
ATLAS18bagj SN2018jme 2018-12-12 --- Ic-norm +15(5) 0.037 (NED)
ATLAS18baiw SN2018jnc 2018-12-12 --- Ia-norm +5 (2) 0.031 (NED)
ASASSN-18abi SN2018jrn 2018-12-12 --- Ia-norm +4 (2) 0.022 (NED)
1) Only red channel spectrum available.
2) Previously classified on TNS by ePESSTO.
3) Not found in V-band acquisition images down to about V~20 mag. Due to the coincidence of the object with the host galaxy center, we obtain a spectrum of the location regardless, finding only host galaxy features in the spectrum.
4) Also presents a quality match to Ia-91bg templates, but without the blue channel it is hard to distinguish.
5) A blue, mostly featureless continuum with broad H and He emission at the reported host redshift, consistent with a young Type II SN.
6) M dwarf spectrum with Balmer series in emission, likely an M dwarf flare.
7) Broad absorption and emission lines are present in the spectrum, however, the quality is too low to definitely determine the SN type. SNID produces several quality matches to post-max Ic-norm templates, but also matches a few SN Ib and II templates from z = 0.03-0.07.
8) Noisy blue continuum, with weak evidence for filled Balmer absorption lines. Combined with the faint blue object in archival PanSTARRS images, this object is likely a CV.
9) M dwarf spectrum, although no H emission present.
