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Spectrocopic Classification of SN 2016ayg (PTSS-16hs) as a Type Ia Supernova

ATel #8824; Jujia Zhang (YNAO), Xiaofeng Wang, Wenxiong Li, Zesheng Yang (Tsinghua University), Bin Li, Haibin Zhao, and Lifan Wang (PMO)
on 16 Mar 2016; 11:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

We obtained an optical spectrum (range 330-880 nm) of SN 2016ayg, discovered by the PMO-Tsinghua Supernova Survey (PTSS), on UT Mar.12.6 2016 with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of Yunnan Astronomical Observatories (YNAO). The spectrum is consistent with a type Ia supernova at around one week before the maximum light. 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 2005iq at t = -6 days from the maximum light. After correcting for a redshift of 0.046 (from the SNID fit) for its host galaxy SDSS J073017.25+250153.5, an expansion velocity of about 11700 km/s can be derived from the absorption minimum of Si II 635.5 nm line.