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Spectroscopic classification of PSN J23532561-1539176 as a 91T-like Type Ia Supernova

ATel #7934; Jujia Zhang (Yunnan Observatories), Xiaofeng Wang (Tsinghua University)
on 21 Aug 2015; 08:50 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Supernovae, Transient

We report an optical spectrum (range 330-860 nm) of PSN J23532561-1539176 (=PS15brr) that was obtained on Aug. 13.83 2015 UT with the 2.4-m telescope (+YFOSC) at LiJiang Gaomeigu Station of YNAO. The spectrum is consistent with a type Ia supernova in the early phase. Cross-correlation with a library of supernova spectra using the comparison tools SNID (Blondin and Tonry 2007, Ap.J. 666, 1024) and GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) shows that it matches with SN 1998es at about -10 days before the maximum light. Adopting a redshift of 0.058 for its host galaxy from the SNID fit, an expansion velocity of about 12700 km/s can be derived from the absorption minimum of SiII 635.5nm.