DRAFT
2026-06-06 17:25:15
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: C.G. Touchard-Paxton (Trinity), E. Charleton (Southampton), M. Ghendrih (Lancaster), N. Shiamtanis, P. Clark, P. Wiseman (Southampton), Claudia Gutiérrez (ICE-CSIC), Shubham Srivastav (Oxford), Michel Dennefel (IAP Paris), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Warsaw), O. Yaron (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), H. Stevance (Oxford), D. R. Young, M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes classifications of 1 Type Ia's and 2 Type II's.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S) and the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Williams et al. 2024 2024RASTI...3..362W) and by the ALeRCE broker (Forster et al. 2020 2021AJ....161..242F).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 June 05, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv, arXiv:2603.28741. doi:10.48550/arXiv.2603.28741).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026odr [ATLAS26gpw] 01:23:02.862 -43:07:38.98 SN Ia-91T-like 0.024 ESO 244- G 023 0.023933 ATLAS At max Phase from SNID-SAGE. Redshift taken as the host's redshift from NED. 01:23:02.862 -43:07:38.98 SN Ia-91T-like 0.024
TNS 2026nxd [ZTF26aayuvvb] 01:31:59.782 +19:12:49.28 SN II 0.037 ZTF After max Redshift and phase from SNID-SAGE. 01:31:59.782 +19:12:49.28 SN II 0.037
TNS 2026obf [ATLAS26gpj] 02:23:14.293 -15:08:54.46 SN II 0.0135 MCG -03-07-007 0.013546 ATLAS After max Phase from SNID-SAGE. Redshift taken as the host's redshift from NED. 02:23:14.293 -15:08:54.46 SN II 0.0135

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