Spectroscopic Classification of PSN J08111645+2510474 as a Type IIb Supernova
ATel #6617; Jujia Zhang (Yunnan Observatories) and Xiaofeng Wang(Tsinghua University)
on 24 Oct 2014; 16:17 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 spectrogram of PSN J08111645+2510474 (range 360-890 nm) that was obtained on 2014 Oct.23.84 UT with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of Yunnan Observatories. The spectrum shows Fe II, Ca II, O I, and prominent H and He I features, consistent with a classification of type IIb supernova. A narrower H-alpha emission is found to sit on top of the broad component, which is perhaps due to the interaction of supernova ejecta with the circumstellar materials. Cross-correlation with a library of supernova spectra using the comparison tool Gelato (Harutyunyan et al. 2008, A&A, 488, 383) shows that it has a better match with SN 2008ax at a few days before the maximum light. After removing a redshift of 0.0137 for the host galaxy NGC 2536, the minimum of the H-alpha absorption is blueshifted by about 12,600 km/s.
