DRAFT
2026-05-17 16:00:04
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.138....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), 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), A. Horowicz (Weizmann), 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 II, 1 Type IIn, and 1 TDE-H-He. 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 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 May 16, using EFOSC2 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 2026jci 15:09:26.182 -10:41:27.26 SN II 0.0245 UGCA 400 0.0245 post-peak Redshift obtained from host galaxy. 15:09:26.182 -10:41:27.26 SN II 0.0245
TNS 2026ldz [ATLAS26ezo] 01:33:47.842 -69:19:44.33 SN Ia 0.056 S1HB046620 post-peak Redshift provided from template best match. 01:33:47.842 -69:19:44.33 SN Ia 0.056
TNS 2026loo [ZTF26aauvalc] 10:22:04.427 -10:30:38.27 TDE-H-He 0.053 10220440-1030385 Redshift provided from template best match. 10:22:04.427 -10:30:38.27 TDE-H-He 0.053
TNS 2026mho [ATLAS26flx] 20:07:38.301 -21:07:06.40 SN IIn 0.008 ESO595-G014 0.008 pre-max Redshift obtained from host galaxy. Previous classification of Type II by the LiONS group. 20:07:38.313 -21:07:06.24 SN IIn 0.008
TNS 2026mim [ATLAS26fmv] 23:07:06.188 -28:36:45.66 SN Ia 0.032 ESO469-G012 0.032 at max Redshift obtained from host galaxy. 23:07:06.188 -28:36:45.66 SN Ia 0.032
TNS 2026mrc [ATLAS26fqh] 11:25:43.622 -16:40:10.37 SN Ia 0.076 87991714318847111 pre-max Redshift obtained from narrow host lines. 11:25:43.622 -16:40:10.37 SN Ia 0.076
TNS 2026mrf [ZTF26aawudnu] 14:51:14.727 +16:41:40.34 SN Ia 0.046 CGCG105-046 0.046 at max Redshift obtained from host galaxy. 14:51:14.727 +16:41:40.34 SN Ia 0.046
TNS 2026mss [ATLAS26frg] 21:29:36.932 -72:02:20.39 SN Ia 0.065 10000,16617,1820 at max Redshift provided from template best match. 21:29:36.932 -72:02:20.39 SN Ia 0.065

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