DRAFT
2026-05-06 23:48:45
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.126....1P
ePESSTO+ re-classification of SN2026kie as a Type Ic Supernova
Authors: C. Pfeffer (Hawaii IfA), A. Gal-Yam (Weizmann), C. Ashall (Hawaii IfA), O. Yaron (Weizmann), J. Anderson (ESO), W. Hoogendam (Hawaii IfA), L. Izzo (INAF), A. Singh (Stockholm), J. Khaulsay (Cardiff), C. Cárdenas (UA), A. Sankar.K (NCU), A. Dutta (NCU), A. Aryan (NCU), T-W. Chen (NCU), C. Inserra (Cardiff), E. Kankare (UTU), T. Müller Bravo (Trinity), P. Pessi (Stockholm), D. R. Young (QUB), J. Johansson (Stockholm)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova
Abstract:
We report the re-classification of SN 2026kie (ATLAS26epm/ZTF26aatzrft/GOTO26dqt) as Type Ic, based on a spectrum acquired with the 3.58m ESO New Technology Telescope. Our high S/N spectrum lacks any obvious contribution from He lines, and we therefore propose that the classification be changed from Type Ib to Type Ic.

SN 2026kie was discovered by ATLAS on 2026-04-22 16:06:45 in NGC 3437 (z = 0.0042). Using the Wide Field Spectrograph (WiFeS) on the 2.3m ANU telescope, the Supernova Alliance classified this object as SN Ib following a superfit match to SN 1987M (Schmidt et al.  2026, TNS Classification Report 2026-1791). We obtained a follow up spectrum on 2026-05-03 03:03:47 with ESO Faint Object Spectrograph and Camera version 2 (EFOSC2) on the 3.58m New Technology Telescope (NTT). Our spectrum shows that the object does not have any features that could be attributed to He lines. Using SNID-SAGE (Stoppa & Smartt, 2026), we find a good match to the Type Ic SN 2004aw for our NTT spectrum. See the attached spectrum for the SNID-SAGE fit. Our spectrum is consistent with those already available on TNS, however the classification was inaccurate as SN 1987M was mislabeled in superfit and is in fact Type Ic, not Type Ib. 

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026kie [ATLAS26epm] 10:52:36.529 +22:55:54.04 SN Ic 0.00424 NGC3437 10:52:36.529 +22:55:54.04 SN Ic 0.00424
File Comments
SN2026kie_2026-05-03_03-03-47.611_ESO-NTT_EFOSC2-NTT_ePESSTOp_0.asci NTT EFOSC2 Spectrum of SN2026kie
26kie-SNID-SAGE_0.png SNID-SAGE fit for 26kie

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