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Spectroscopic Classification of ASASSN-13dn

ATel #5667; P. Martini (OSU), J. Elias (NOAO), S. Points (CTIO), J. L. Prieto (Princeton), B. J. Shappee, K. Z. Stanek, C. S. Kochanek, T. W-S. Holoien, J. Jencson, U. Basu, J. F. Beacom (Ohio State), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 16 Dec 2013; 21:03 UT
Credential Certification: Jose L. Prieto (jose@obs.carnegiescience.edu)

Subjects: Optical, Supernovae, Transient

We obtained optical spectra of ASASSN-13dn (ATel #5665). The candidate was confirmed with the new KOSMOS instrument (Kitt Peak Ohio State Multi-Object Spectrograph), which is presently being commissioned at the KPNO 4-m Mayall telescope. Observations were obtained with both the blue and red VPH grisms (50 min each) for a combined wavelength range of 380nm to 965nm at R ~ 2000. The spectrum of ASASSN-13dn is characteristic of a Type II SN at the redshift of its host galaxy (z=0.023). We detect Balmer lines, Fe II, Na I/He I, and the Ca II triplet. After correcting for the host galaxy recession velocity, we measure a minimum velocity of the P-Cygni profile of H-alpha at approx. -14,000 km/s.