SCAT classification of optical transients

ATel #12472; M A Tucker, A Do, A V Payne, B J Shappee, M E Huber (IfA), K Z Stanek , R Pogge (OSU)
on 4 Feb 2019; 16:36 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Michael Tucker (tuckerma95@gmail.com)

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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, Lanz et al. 2005). Transients were classified using the SuperNova IDentification code (SNID, Blondin & Tonry 2007, ApJ, 666, 1024). When available, data and light curves from Lasair (https://lasair.roe.ac.uk/) was used. Redshifts given to 3 decimal places are from NED or derived from host galaxy emission lines, otherwise redshifts are determined using supernova lines.

 
Survey Name       IAU Name    Date Obs.     Disc ATel.      Type        Phase     Redshift          Notes 
------------------------------------------------------------------------------------------------------------------- 
---               2019akj     2019-02-03    ---             unconfirmed ---         ---              (1) 
ASASSN-19ah       2019im      2019-02-03    ATel#12393      Ia-norm     +30(10)     0.043 
ASASSN-19bi       2019aef     2019-02-03    ---             AGN         ---         0.066 
ASASSN-19bk       2019aex     2019-02-03    ---             Ia-norm     +3 (4)      0.039 
ASASSN-19bs       2019ahh     2019-02-03    ---             Ia-91bg     +3 (3)      0.023 
ASASSN-19bx       2019aja     2019-02-03    ---             Ia-norm     +10(3)      0.036 
ATLAS19cau        2019ahj     2019-02-03    ---             Ia-norm     +0 (5)      0.053            (2) 
ATLAS19cbq        2019aje     2019-02-03    ---             Ic-norm     +20(10)     0.127            (3) 
ATLAS19ccn        2019akg     2019-02-03    ---             Ia-91T      -4 (3)      0.039 
ATLAS19cct        2019aki     2019-02-03    ---             Ia-norm     -5 (3)      0.075     
ATLAS19cdc        2019akk     2019-02-03    ---             Ia-norm     +3 (2)      0.12      
ATLAS19cde        2019akl     2019-02-03    ---             Ia-norm     +9 (2)      0.11 
Gaia19akc         2019akv     2019-02-03    ---             CV/Stellar  ---         ---              (4) 
ZTF19aagviec      2019ahv     2019-02-03    ---             SN          ---         0.076            (5) 
 
 

1) No object found, unless the variable is indeed the red star ~8" to the East of the reported position. No spectrum was taken.
2) Best match is a normal SN Ia near maximum light, however, spectrum also provides quality matches to 91T-like SN Ia near maximum.
3) Spectrum heavily contaminated by host galaxy emission.
4) Halpha in emission and Hbeta+Hdelta+CaII in absorption at z=0. Blue spectrum, likely a CV, although no HeI/HeII observed, so could be another class of stellar variable.
5) Reported nuclear transient, a spectrum was taken at the transient's location but consists mostly of host galaxy light. Weak, broad Balmer lines, if real, indicate a possible SN II.