Spectroscopic observations of AT2016hnk by NUTS (NOT Un-biased Transient Survey)

ATel #9703; G. Cannizzaro (SRON), M. Fraser (University College Dublin), S. Benetti, A. Pastorello, N. Elias-Rosa (Padova), M. Stritzinger (Aarhus U), S. Dong, S. Bose (KIAA-PKU), E. Hsiao (Florida State) R. T. Rasmussen (NOT) on behalf of the NUTS collaboration
on 2 Nov 2016; 15:54 UT
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)

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The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of the transient SN2016hnk (aka ATLAS16dpc) in the host galaxy KUG 0210-078. The candidate was discovered by the ATLAS survey (Tonry et al., ATel #9685).

The observations were performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.6 nm).

 
Survey Name | IAU Name  | Discovery (UT)| Discovery mag | Observation (UT) | Redshift | Type   | Phase   | Notes   
ATLAS16dpc  | SN2016hnk | 2016-10-27.47 | 17.9          | 2016-11-01.09    | 0.016    | I      | ?       | (1)   

(1) The spectrum is relatively red, with strong lines dominated by the Ca NIR triplet, OI 7774, and SiII 6355. The minimum of the SiII line is at a velocity of 10,000 km/s. We were unable to obtain a good match to any supernova templates using SNID. The closest match to the SN using GELTAO appear to be 1991bg-like sub-luminous Type Ia SNe around maximum light, with possible additional HeI lines. The He line lines are at a somewhat lower velocity of 6500 km/s, compared to SiII. We note that the absolute magnitude of the transient at discovery is -16.1.

Classifications were performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.