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Spectroscopic Classification of ASASSN-15rm as a Type Ia Supernova

ATel #8209; W. Zheng, G. Halevi, I. Shivvers, H. Yuk, A. V. Filippenko (UC Berkeley)
on 23 Oct 2015; 06:05 UT
Credential Certification: Weikang Zheng (zwk@umich.edu)

Subjects: Supernovae

We report that inspection of a CCD spectrum (range 350-1050 nm) of ASASSN-15rm (ATel #8192), obtained on Oct. 20.50 UT with the Shane 3-m reflector (+ Kast spectrograph) at Lick Observatory, shows that the object is a normal Type Ia supernova roughly 1 week past maximum brightness. Cross-correlation with a library of supernova spectra using the "SuperNova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates a similarity with several normal Type Ia supernovae about 8 days after maximum light. The redshift derived from SNID is z = 0.023, consistent with the host-galaxy (2MFGC 05056) redshift given in NED (z = 0.021). Adopting z = 0.021, the rest-frame photospheric velocity estimated from the minimum of the Si II 635.5-nm feature is 9800 ± 200 km/s.