Classification certificate for object 2011df
TNS Classification Report No. 2090 [ 2018TNSCR.783....1B ]

Date Received (UTC): 2018-06-08 22:22:26
Sender: Mr. Dave Balam
Group: DAO_OTS

Dave Balam report/s a classification of object: SN 2011df

Type: SN Ia
Redshift: 0.015

The following Classification spectrum was provided:

Obsdate: 2011-05-28 08:24:00
Instrument: Plaskett
Telescope: Dominion AStrophysical Observatory

Remarks: D. D. Balam, Dominion Astrophysical Observatory, National Research Council of Canada (NRCC); M. L. Graham, Las Cumbres Observatory Global Telescope, University of California at Santa Barbara; E. Y. Hsiao, Lawrence Berkeley Laboratory; G. Sarty, University of Saskatchewan; and D. W. E. Green, Harvard University, report that a spectrogram (range 382-714 nm, resolution 0.3 nm) of PSN J19273364+5423113 = SN 2011df, obtained on May 28.36 UT with the 1.82-m Plaskett Telescope of the National Research Council of Canada, shows it to be a type-Ia supernova before maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2011df is most similar to the type-Ia supernova 1989B a few days before maximum light.

Details of the object and its spectra can be viewed here: