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Spectroscopic classification of AT 2017dit and 2017dei as a normal Type Ia supernovae

ATel #10333; S. Bose (KIAA-PKU), T. Holoien, K. Z. Stanek (OSU), Subo Dong (KIAA-PKU)
on 30 Apr 2017; 13:34 UT
Credential Certification: Subhash Bose (bose@pku.edu.cn)

Subjects: Optical, Supernovae

Referred to by ATel #: 10335

We report optical spectroscopic observation of supernova candidates Gaia17bci (2017dit) and Gaia17bat (2017dei) taken on UT 2017-04-30.30 and 2017-04-30.46 respectively, with OSMOS (range 398-686 nm) mounted on the MDM 2.4m telescope at KPNO. The target was reported by Gaia Alerts (http://gsaweb.ast.cam.ac.uk/alerts/alertsindex). We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to identify the type and phase of the SN spectra.

The spectrum for 2017dit/Gaia17bci matches with normal SNe Ia around a week before maximum. SNID estimated redshift is consistent with the host redshift of 2MASX J15275941+4250592 (z=0.018590, NED).

The best match for the spectrum of 2017dei/Gaia17bat is found with Type Ia supernova SN 2004gs (at t=+4day). The spectrum also matches with a number of normal SNe Ia, few days after maximum (1-8 days). SNID estimated redshift is also found to be consistent with the host redshift of ESO 529- G 005 (z=0.019804, NED).