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Classification of ASASSN-15js and ASASSN-15kk as Normal Type Ia Supernovae

ATel #7609; A. Porter (Clemson), A. Wilber (ASU), M. Neric (ASU), R. M. Wagner (LBTO/OSU), S. Starrfield (ASU), and C. E. Woodward (U. Minnesota)
on 9 Jun 2015; 17:41 UT
Credential Certification: R. Mark Wagner (rmw@as.arizona.edu)

Subjects: Optical, Supernovae

We obtained optical spectra (range: 398-686 nm; resolution 0.3 nm) of ASASSN-15js (ATEL #7548) and ASASSN-15kk (ATEL #7593) on 2015 June 7.159 and 8.206 UT respectively with the Hiltner 2.4 m Telescope (+OSMOS) of the MDM Observatory on Kitt Peak, Arizona. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to perform a cross-correlation with a library of SN spectra. We find that the spectrum of ASASSN-15js is most consistent with normal Type Ia SN 2 weeks after maximum light. After correcting for the host galaxy redshift (z=0.021), we measure a Si II 635.5 nm expansion velocity of -9500 km/s. For ASASSN-15kk, we find that the spectrum is similar to the normal Type Ia supernova SN2003cg at -2 days at a redshift of 0.013. After correcting for the redshift, the Si II 635.5 nm expansion velocity is -11,000 km/s.