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

ATel #8304; Weimin Yi and Jujia Zhang (Yunnan Observatories)
on 19 Nov 2015; 15:04 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

We report an optical spectrum (range 350-900 nm) of ASASSN-15sx (ATel #8302) obtained on UT 2015 Nov. 19.56 with the 2.4-m telescope (+YFOSC) at Lijiang Observatory of Yunnan Observatories. The spectrum is consistent with a type Ia supernova at a few days before the maximum light. Cross-correlation with a library of  supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, ApJ. 666, 1024) shows that it matches with SN 2001G at t = -2 days. Adopting a redshift of 0.035 for its host galaxy ESO 472-G018, an expansion velocity of about 11,500 km/s can be derived from the absorption minimum of Si II 635.5 nm.