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Spectroscopic Classification of ASASSN-13dl

ATel #5508; J. L. Prieto (Princeton), A. Sheffield (Columbia), R. M. Wagner (OSU), C. E. Woodward (U. Minnesota), S. G. Starrfield (ASU), R. A. Hounsell (STScI), on behalf of the ASAS-SN team
on 24 Oct 2013; 18:53 UT
Credential Certification: Jose L. Prieto (jose@obs.carnegiescience.edu)

Subjects: Optical, Supernovae

We report spectroscopic observations of the candidate supernova ASASSN-13dl (ATel #5460, #5469). We obtained optical spectra of ASASSN-13dl with the MDM 2.4m + Modspec (range 5100-7200 Angs.) on UT Oct. 22.5 and with the Bok 2.3m + B&C (range 3950-7200 Angs.) on UT Oct. 23.4. The spectra show features characteristic of a Type Ia SN a couple of weeks after maximum light. After cross-correlating with a library of SN spectra using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find that ASASSN-13dl is best fit with normal SN Ia at +14 days after maximum and with redshift from the SN features of z=0.027 +/- 0.003. We detect a weak emission line in the B&C spectrum, in which the slit was aligned with the faint host galaxy, at 6751.2 Angstroms. This is most likely H-alpha from the host, which puts it at redshift z=0.0287, consistent with SNID. A plot of the B&C spectrum of ASASSN-13dl can be found here.