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Spectroscopic classification of AT 2016iug as a Type II supernova

ATel #9845; D. Milisavljevic (Harvard-Smithsonian Center for Astrophysics), M. Negro, N. Alvarez Crespo, F. Massaro, L. Latronico (INFN and University of Turin), A. Paat (Kitt Peak National Observatory)
on 11 Dec 2016; 02:25 UT
Credential Certification: D. Milisavljevic (dmilisav@cfa.harvard.edu)

Subjects: Optical, Supernovae

A moderate resolution (R ~ 2100) optical spectrum (range 5000-9000 Angstroms) of AT 2016iug was obtained December 10.52 UT with the Mayall 4m telescope (+ KOSMOS) at Kitt Peak National Observatory. Details about the candidate supernova were posted on the Transient Name Server by the discoverers S. Leonini et al. and the Italian Supernovae Search Project. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows the transient to be consistent with a Type II supernova. Several good matches are found with Type IIP supernovae (e.g., 1999em, 2004et) 3-4 weeks after maximum light. After correcting for the redshift z = 0.024 of the host galaxy UGC 07230 (Springob et al., 2005, ApJS, 160, 149), the minimum of the Halpha P-Cyg absorption is measured to be blueshifted by approximately 9000 km/s.