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DAO spectroscopic classification of ASSASN-15nr in CGCG-082-031 as a type-Ia supernova

ATel #7882; D. D. Balam (Dominion Astrophysical Observatory) and M. L. Graham (LCOGT-USB)
on 7 Aug 2015; 08:22 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David D. Balam (cosmos@uvic.ca)

Subjects: Optical, Supernovae

A spectrum was obtained on UT Aug. 7.25 of ASASSN-15nr (ATEL 7881) using the 1.82-m Plaskett telescope (National Research Council of Canada) covering the range 365-720 nm (resolution 0.35 nm). Cross-correlation with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows ASASSN-15nr to be a type-Ia supernova of the super-luminous 91T-type a few days before maximum light. We find a good fit to the template of SN 1999aa at T=-4 days. Using the published redshift of CGCG-082-031 (Falco, E. et al., 2000, The Updated Zwicky Catalogue) of z=0.023 yields an expansion velocity for the Si II (rest 635.5 nm) feature of 10,100 km/s.