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Du Pont Classifications of 8 ASAS-SN, ATLAS and Gaia Supernovae

ATel #11093; N. Morrell (Las Campanas Observatory), Benjamin J. Shappee (IfA, U Hawaii), Maria Drout (Hubble Fellow, Carnegie Observatories)
on 27 Dec 2017; 01:02 UT
Credential Certification: Benjamin Shappee (bshappee@obs.carnegiescience.edu)

Subjects: Optical, Supernovae

We report optical spectroscopy (range 370-910 nm) of eight supernovae discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al. 2014, ApJ, 788, 48), ATLAS (Tonry et al. 2011, PASP, 123, 58) and Gaia using the du Pont 2.5-m telescope (+ WFCCD) at Las Campanas Observatory on Dec 17 through Dec 20 2016 UT. We performed a cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024). The details of the classifications are as follows:

 
Name             TNS Name    Disc. ATel     Spec. Date     Spec. Type    SNID Phase   SNID z     Notes      
Gaia17dhi        2017izl                    2017-12-20     II            +30          0.01    
ASASSN-17qu      2017ixq     ATel #11074    2017-12-20     Ia            +9           0.08 
ASASSN-17qv      2017ixu     ATel #11074    2017-12-20     Ia            +1           0.06 
ASASSN-17qw      2017ixw     ATel #11074    2017-12-20     Ia            -1           0.07 
ASASSN-17qy      2017iyl     ATel #11074    2017-12-19     Ia            0            0.03       (1) 
ASASSN-17qt      2017ixp     ATel #11074    2017-12-17     II            -1           0.036      (2) 
ASASSN-17qx      2017iyk                    2017-12-19     Ia            -1           0.07        
ATLAS17nhc       2017iit                    2017-12-19     II            +23          0.015      (3) 

(1): Agrees with Padova-Asiago classification on TNS.

(2): Blue continuum with slight Balmer emission features.

(3): An early spectrum showed a featureless continuum in ATel #11014. Given the discovery data, the transient is older than the SNID phase implies.