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DAO spectroscopic classification of four recent supernovae

ATel #9016; D. D. Balam (Dominion Astrophysical Observatory) and M. L. Graham ( University of Washington)
on 1 May 2016; 21:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David D. Balam (cosmos@uvic.ca)

Subjects: Optical, Supernovae

Spectra were obtained using the1.82-m Plaskett telescope (National Research Council of Canada) covering the range 365-710 nm (resolution 0.35 nm) of four recently-discovered optical transients: ASASSN-16eu = 2016ccf (ATEL #9011) , ASASSN-16es = 2016cbx (ATEL #9001) , CSS160417:133446+135114 and (Pan-STARRS1) ps16cbu. We find the following: ASASSN-16eu = 2016ccf - UT May 01.23. Cross-correlation with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows this object to be a core-collapse supernova near maximum light. We find a good fit to the template of (SN IIp) 2006bp at T = -2.days. ASASSN-16es = 2016cbx - UT May 01.31. Cross-correlation with a template library shows ASASSN-16es to be a SN Ia shortly after maximum light. Our best fit is to SN 1991M at T = +3 days. The apparent host galaxy is SDSS J115054.45+021828.1 with no published redshift. The SNID fit yields a redshift of z = 0.015 for the supernova. CSS160417:133446+135114 - UT May 01.43. Cross-correlation with a template library shows CSS160417:133446+135114 to be a SN Ia several weeks post-maximum light. Our best fit is to SN 1994ae at T = +11 days. The host galaxy appears to be NGC 5521 (z = 0.019, V = 5782 km/s, NED). Using the published redshift of z=0.019 we measure an expansion velocity for the Si II (rest 635.5 nm) feature of 8800 km/s. (Pan-STARRS1) ps16cbu = 2016 ccb - UT May 01.48. Cross-correlation with a template library shows ps16cbu to be a SN Ia shortly after maximum light. Our best fit is to the normal SN Ia 1994ae at T = +2 days. The apparent host galaxy is CGCG 424-006 ( z = 0.028, V = 8506 km/s, NED). Using the published redshift of z=0.028 we measure an expansion velocity for the Si II (rest 635.5 nm) feature of 9800 km/s.