DRAFT
2026-05-20 13:55:57
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.145....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: Jasvinderjit Khaulsay (Cardiff), Jonathan Quirola (Radboud), Meng-Han Lee, Anirban Dutta, Aiswarya Sankar.K (NCU), Shubham Srivastav (Oxford), Lluís Galbany (ICE-CSIC), Tanja Petrushevska (UNG),  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), C. Stubbs (Harvard), Gregory Corcoran (UCD)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes one Type II supernova and four Type Ia supernovae.

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), 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).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 19, 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), and DASH (Muthukrishna et al. 2019  2019ApJ...885...85M).

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 2026led [ATLAS26ezt] 00:49:41.537 -47:07:46.57 SN Ia 0.05 WISEA J004941.24-470745.2 ATLAS Post-peak Phase and redshift from SNID and ASTRODASH. Classification shows similarity to 1991T-like. 00:49:41.561 -47:07:46.51 SN Ia 0.05
TNS 2026maa [ZTF26aauxdkn] 16:50:45.555 +22:21:18.66 SN Ia 0.101 WISEA J165045.55+222118.6 0.101 ZTF Post-peak Phase from SNID-SAGE. Redshift from DESI. 16:50:45.555 +22:21:18.66 SN Ia 0.101
TNS 2026mlc [ATLAS26fny] 22:04:13.307 -62:36:12.13 SN II 0.055 ATLAS Post-peak Redshift from host galaxy lines. Phase from ATLAS light curve and SNID-SAGE. Redshift matches with that of SNID-SAGE. Host in LS-DR10 (Objid: 3276). 22:04:13.307 -62:36:12.13 SN II 0.055
TNS 2026mld [ATLAS26fnz] 20:30:20.180 -54:23:56.77 SN Ia 0.055 WISEA J203020.29-542355.1 0.055 ATLAS Post-peak Phase from ATLAS light curve and SNID-SAGE. Redshift from the host. 20:30:20.180 -54:23:56.77 SN Ia 0.055
TNS 2026msv [ATLAS26fri] 21:28:12.368 -65:49:16.82 SN Ia-91bg-like 0.056 WISEA J212811.98-654915.9 0.056 ATLAS Post-peak Phase from ATLAS light curve and SNID-SAGE. Redshift from the host. 21:28:12.368 -65:49:16.82 SN Ia-91bg-like 0.056

Comments

Anirban
Dutta

Wed, 05/20/2026 - 13:55