Spectroscopic Classification of PSN J12245668+2121410
ATel #6171; Jujia Zhang (Yunnan Observatories); Xiaofeng Wang (Tsinghua University)
on 26 May 2014; 07:54 UT
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)
Subjects: Optical, Supernovae, Transient
Jujia Zhang, Yunnan Observatories (YNAO); Xiaofeng Wang, Tsinghua University, report on an optical spectrogram (range 340-870 nm) that was obtained on 2014 May 25.68 UT with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of YNAO. The spectrum is consistent with a type Ia supernova at around 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 2003ch at t = 0 days. Adopting a redshift of 0.0557 for the host galaxy KUG 1222+216 from the narrow emission line, they measure a velocity of the Si II 635.5-nm absorption feature to be about 7400 km/s. The weak absorption feature at 638.0 nm is likely due to the C II 6580 line. These features are reminiscent of the behavior of super-Chandrasekhar-mass supernova like SN 2009dc (Taubenberger et al. 2011, MNRAS, 412, 2735).
