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Spectroscopic Confirmation of ASASSN-14lt as a Type Ia Supernova

ATel #6813; Jujia Zhang(Yunnan Observatories and Xiaofeng Wang (Tsinghua University)
on 13 Dec 2014; 01:46 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 350-810 nm) of ASASSN-14lt on UT 2014 Dec.11.71 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 at a few days before the maximum light. Cross-correlation with a library of supernova spectra using the comparison tool Gelato (Harutyunyan et al. 2008, A&A, 488, 383) shows that it matches with SN 2001eh at t = -5 days, which is consistent with the Asiago Classification (ATel#6804). Noticeable Na I absorption due to the host galaxy is visible in the spectrum, suggesting that this supernova may suffer from some host-galaxy reddening. Given a redshift of 0.032 for the host galaxy IC 0299, an expansion velocity of about 10700 km/s can be deduced from the Si II 635.5 absorption minimum.