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Spectroscopic Classification of ASASSN-15og

ATel #7932; T. Monroe (STScI), Y. Shen (University of Illinois), S. Dong (KIAA-PKU), J. L. Prieto (UDP; MAS)
on 20 Aug 2015; 12:52 UT
Credential Certification: Jose L. Prieto (jose.prietok@mail.udp.cl)

Subjects: Optical, Supernovae, Transient

We obtained a low-resolution optical spectrum (range 3400-9500 Angs.; resolution ~8.5 Angs.) of ASASSN-15og (ATel #7912) on UT August 19.3 with the du Pont telescope (+ B&C) at Las Campanas Observatory. The spectrum of ASASSN-15og shows a blue continuum, intermediate and narrow width Balmer lines in emission, and other broad spectral features at rest wavelengths 4600 Angs. and 5000-6000 Angs. The spectrum is similar to the Type Ia-CSM/Type IIn SN 2005gj (e.g., Prieto et al. 2007). Cross-correlation with a library of supernova spectra using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows that the spectrum of ASASSN-15og is most similar to SN 2005gj at ~20 days after peak.