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Spectroscopic classification of Gaia17cpj by NUTS (NOT Un-biased Transient Survey)

ATel #10865; C. Gall (DARK, KU), Andrea Pastorello (Padova), F. Onori (SRON), Peter Lundqvist (Stockholm), M. Stritzinger (Aarhus U), S. Holmbo (Aarhus U), S. Dong (KIAA-PKU) and S. Bose (KIAA-PKU), on behalf of the NUTS collaboration
on 18 Oct 2017; 19:26 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Christa Gall (christa@dark-cosmology.dk)

Subjects: Optical, Supernovae, Transient

The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) collaboration reports the spectroscopic classification of Gaia17cpj (SN2017hix) in the host galaxy LEDA2723806. The candidate was discovered by the Gaia Photometric Science survey. The object had not been detected in G-Gaia images taken on 2017-08-07.4 and before.

The observation was performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC on 2017-10-17.8 UT (range 350-950 nm; resolution 1.4 nm).

Name         |  IAU Name   |  Redshift  |  Discovery (UT) |  Discovery mag  |  Type  | Phase     | Notes 
Gaia17cpj    |  SN 2017hix |  0.012     |  2017-10-13.12  |  16.9           |   Ic   | after max | (1) 

(1) In agreement with ATel#10863, a good match is obtained using SNID with spectra of the Type Ic SNe 1997gr (Hunter et al. 2009, A&A, 508, 371) about 1 month after the maximum light. The spectrum shows the classical lines of an evolved stripped envelope SN, including Ca II H&K, several Fe II multiplets (multiplet 42, in particular, is prominent), Na I 5890-5896 A, Si II, O I 7774A, and the Ca II near-IR triplet. The redshift, which is significantly lower than that reported in ATel#10863, is obtained from the position of the narrow Halpha attributed to the host galaxy background.

Classification was performed using the SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tool.