DRAFT
2026-05-15 15:00:09
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.136....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Khaulsay (Cardiff), J. Quirola-Vásquez (Radboud) , C. Aster (Cardiff), M. Dennefeld (Sorbonne), N. Ihanec (ING), G. Pignata (Tarapaca), 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)
Source Group: ePESSTO+
Keywords: Astronomical Databases, Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes classifications of 4 Type Ia's, 1 Type II, 1 Type Ia-91bg-like, and confirmation of a previous classification for a Type Ic. We encourage followup observations.

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), 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), and the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 14, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3345-7470, 14A 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 2026lgi [ZTF26aaurdwh] 08:06:32.073 +17:26:55.74 SN Ia 0.11 post-peak redshift provided from template best match. 08:06:32.073 +17:26:55.74 SN Ia 0.11
TNS 2026idh [ATLAS26dre] 09:22:22.962 -61:02:44.11 SN Ic 0.007 ESO126-G010 0.007 post-peak Redshift from host galaxy. Confirming originally BlackGEM classification. 09:22:22.962 -61:02:44.11 SN Ic 0.007
TNS 2026ljt [ATLAS26fdh] 12:05:45.495 +31:03:32.11 SN Ia-91bg-like 0.023 UGC07085ANED01 0.023 at max Good matches with Ia-CSM and 91bg-like, but lightcurve on the rise for ~20 days. Redshift from host galaxy. 12:05:45.495 +31:03:32.11 SN Ib-pec 0.02306
TNS 2026lkc [ATLAS26feb] 13:25:28.024 +09:49:28.04 SN Ia 0.09 SDSS J132527.82+094927.7 0.095 post-peak Redshift from host galaxy. 13:25:28.024 +09:49:28.04 SN Ia 0.09
TNS 2026llc [GOTO26eey] 20:37:10.787 -26:11:29.67 SN Ia 0.04 20371095-2611305 at max Redshift from template best-match. 20:37:10.787 -26:11:29.67 SN Ia 0.04
TNS 2026mfl [GOTO26epb] 19:37:11.200 -44:20:46.81 SN II 0.02 at max Redshift from template best-match. 19:37:11.200 -44:20:46.81 SN II 0.02
TNS 2026mfm [GOTO26epc] 19:08:51.668 -48:32:04.79 SN Ia 0.05 post-peak Redshift from template best-match. 19:08:51.668 -48:32:04.79 SN Ia 0.05

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