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Spectroscopic Classification of ASASSN-15tw as a Type II-P Supernova

ATel #8397; Yu-Xin Xin and Ju-Jia Zhang (Yunnan observatories)
on 11 Dec 2015; 01:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

We obtained an optical spectrum (range 350-900 nm) of ASASSN-15tw (ATel#8391) on UT 2015 Dec.10.91 with the Li-Jiang 2.4-m telescope (+YFOSC) at Li-Jiang observatory of Yunnan Observatories. The spectrum is similar to that of a type-IIP supernova at a few days after explosion. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that it matches with SN 2004et at t = + 9 days since the explosion. Given a recession velocity of 2572 km/s for the host galaxy DDO 151, an expansion velocity of about 7500 km/s can be deduced from the H-alpha absorption minimum.