Classification certificate for object 2017ai
TNS Classification Report No. 701 [ 2017TNSCR..36....1P ]

Date Received (UTC): 2017-01-08 20:30:40
Sender: Jose Prieto
Group: ASAS-SN

J. L. Prieto, G. Simonian report/s a classification of object: SN 2017ai

Type: SN Ia

Remarks: We obtained an spectrum of ASASSN-17ae/AT2017ai (ATel #9948) on UT 2017 Jan 7.5 with OSMOS mounted on the MDM 2.4m telescope at KPNO. The spectrum of ASASSN-17ae is that of a normal SN Ia around maximum light. After cross-correlation with a library of SN spectra using SNID, we find that the best fit template is that of the normal SN Ia 2003ch at 0 days. After correcting for the redshift of the host galaxy (z=0.05027), we measure a Si II 635.5 nm expansion velocity from the P-Cygni absorption trough of 10900 km/s.

The following Classification spectrum was provided:

Obsdate: 2017-01-07 12:09:19
Instrument: OSMOS
Telescope: MDM 2.4m Hiltner

Details of the object and its spectra can be viewed here: https://wis-tns.weizmann.ac.il/object/2017ai