Spectroscopic Classification of PS15cku as a Type Ia Supernova
ATel #8200; Jujia Zhang (Yunnan Observatories) and Xiaofeng Wang (Tsinghua University)
on 21 Oct 2015; 04:02 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 340-900 nm) of PS15cku that was obtained on Oct.20.7 2015 UT with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of YNAO. The spectrum is consistent with a type Ia supernova 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, Ap.J. 666, 1024) shows that it matches with SN 2003cg at t = -3 days. Adopting a redshift of 0.023 for its host galaxy 2MASX J01242239+0335168 (from the narrow emission of the spectrum), an expansion velocity of about 11000 km/s can be derived from the absorption minimum of Si II 635.5 nm.
