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Spectroscopic Classification of SN 2016W as a Type Ia Supernova

ATel #8580; Jujia Zhang (YNAO), Xiaofeng Wang (Tsinghua University)
on 22 Jan 2016; 17:05 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

We report an optical spectrum (range 345-900 nm) of SN 2016W obtained on UT 2016 Jan. 22.6 with the 2.4 m telescope ( LJT + YFOSC) at Lijiang observatory of Yunnan Observatories. The spectrum is consistent with a Type Ia supernova around 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 2002aw at t = -1 days. Adopting a redshift of 0.0192 for its host galaxy NGC 946, an expansion velocity of about 11,700 km/s can be derived from the absorption minimum of Si II 635.5 nm.