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Spectroscopic Classification of ASASSN-17ms (SN 2017gvp) as a young Type Ia Supernova

ATel #10782; Jujia Zhang, Yuxin Xin (Yunnan Observatories) and Xiaofeng Wang (Tsinghua University)
on 26 Sep 2017; 02:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)

Subjects: Optical, Supernovae

Referred to by ATel #: 10783

We report an optical spectrum (range 350-900 nm) of ASASSN-17ms (SN 2017gvp) obtained on UT 2017 Sep. 26.6 with the 2.4-m telescope (LJT+YFOSC) at Lijiang Observatory of Yunnan Observatories. The spectrum is consistent with a type Ia supernova at 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, ApJ. 666, 1024) shows that it matches with SN 2007le at t = -7 days. Adopting a redshift of 0.023 for its host galaxy UGC 12739, an expansion velocity of about 11,500 km/s can be derived from the absorption minimum of Si II 635.5 nm.