Spectroscopic Classification of ASASSN-15bn as a Type Ia Supernova
ATel #7006; Jujia Zhang (Yunnan Observatories) and Xiaofeng Wang (Tsinghua University)
on 29 Jan 2015; 13:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Tianmeng Zhang (armengjade@gmail.com)
Subjects: Optical, Supernovae, Transient
We report an optical spectrogram (range 340-890 nm) of ASASSN-15bn that was obtained on 2015 Jan.28.9 UT with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of Yunnan Observatories. The spectrum is similar to that of a type Ia supernovae a few days after maximum light. Cross-correlation with a library of supernova spectra using the comparison tool SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 2004bg at t = +3.0 days. Given a redshift of 0.028 for the host galaxy (from the SNID fit), an expansion velocity of about 10200 km/s can be deduced from the Si II 635.5 absorption minimum.
