DRAFT
2026-05-18 16:00:01
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.142....1A
ePESSTO+ spectroscopic classification of optical transients
Authors: C. Aster (Cardiff), J. Quirola-Vásquez (Radboud), J. Khaulsay (Cardiff), M. Dennefeld (Sorbonne), N. Ihanec (ING), G. Pignata (Tarapaca), G. Corcoran (UCD), G. Dimitriadis (Lancaster), G. Leloudas (DTU), J. Sollerman (Stockholm), 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), S. Srivastav, 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 5 Type Ia, 1 Type Ia-91bg-like, 2 Type II, 1 Type IIn-pec and 1 SN. 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), the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD) and by the ESA Gaia Photometric Science Alerts Team DPAC.

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 17, 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 2026mlg [ATLAS26fok] 14:13:17.140 -79:34:21.34 SN Ia 0.08 14131776-7934324 post-peak Redshift provided from template best match. 14:13:17.140 -79:34:21.34 SN Ia 0.08
TNS 2026mjd [ZTF26aawfedw] 15:35:05.220 +13:11:44.87 SN 0.074 Blue featureless continuum. 15:35:05.182 +13:11:44.84 SN 0.074
TNS 2026mlm [ZTF26aavqwvz] 13:34:36.493 -16:20:11.82 SN IIn-pec 0.1 13343649-1620130 post-peak Redshift provided from template best match. 13:34:36.493 -16:20:11.82 SN IIn-pec 0.1
TNS 2026mxl [ATLAS26fuo] 12:52:09.457 -21:51:40.07 SN Ia-91bg-like 0.023 ESO575-G013 0.023 Redshift from host galaxy. 12:52:09.438 -21:51:40.34 SN Ia-91bg-like 0.023
TNS 2026lpz [ATLAS26fgr] 14:59:35.556 -04:53:05.25 SN Ia 0.04 102132248979549044 post-peak Redshift from template best-match. 14:59:35.556 -04:53:05.25 SN Ia 0.04
TNS 2026mkj [ZTF26aawdydq] 19:52:57.092 -14:42:22.29 SN Ia 0.1 90352982375183742 Redshift from template best-match. 19:52:57.092 -14:42:22.29 SN Ia 0.1
TNS 2026mtw [ZTF26aawkrmu] 17:47:43.955 +18:07:55.84 SN II 0.04 17474399+1808002 Redshift from template best-match. 17:47:43.955 +18:07:55.84 SN II 0.04
TNS 2026muv [ATLAS26frx] 13:58:59.916 -52:18:37.35 SN II 0.013 WKK3829 0.013 post-peak Redshift from host galaxy. 13:58:59.916 -52:18:37.35 SN II 0.013
TNS 2026lvp [GOTO26ems] 20:22:36.258 +10:37:40.58 SN Ia 0.07 20223634+1037422 post-peak Redshift from template best-match. 20:22:36.221 +10:37:40.54 SN Ia 0.07
TNS 2026mjw [DCAP75] 13:45:32.466 +06:11:22.36 SN Ia 0.177 SDSSJ134532.45%2B061122.0 0.177 Redshift from host galaxy. 13:45:32.466 +06:11:22.36 SN Ia 0.177

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