DRAFT
2026-06-13 18:13:46
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.194....1T
ePESSTO+ spectroscopic classification of optical transients
Authors: C.G. Touchard-Paxton (Trinity), E. Charleton (Southampton), M. Ghendrih (Lancaster), C. Dashwood-Brown, N. Shiamtanis, P. Clark, P. Wiseman (Southampton), A. Aryan (NCU), F. Onori (INAF), S. Faris (Tel Aviv), 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), E. Zimmerman (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's of various sub-types and 1 transient showing a featureless blue continuum, at a location consistent with the nucleus of its host.

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 Jun 12, 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 2026myc [ATLAS26fvj] 20:38:48.864 -58:53:21.28 SN Ia 0.106 +26 d Redshift and phase from SNID-SAGE. 20:38:48.864 -58:53:21.28 SN Ia 0.106
TNS 2026nwe [ATLAS26goe] 02:49:35.553 -30:59:49.56 SN Ia 0.026 +6 d Redshift and phase from SNID-SAGE. Confirmation of Ia-norm classification, consistent with earlier BlackGEM classification. 02:49:35.557 -30:59:49.59 SN Ia 0.026
TNS 2026nvf [ATLAS26gnm] 10:51:05.359 -42:28:56.35 SN Ia-91T-like 0.012 At max Redshift and phase from SNID-SAGE. 10:51:05.359 -42:28:56.35 SN Ia-91T-like 0.012
TNS 2026omv [ZTF26abahbox] 20:48:06.875 -08:30:06.11 SN Ia-pec 0.02 6dF J2048066-083005 0.020127 -8.5 d Phase from SNID-SAGE, redshift from host. Spectrum consistent with existing GOTO classification, with unclear classification between a 91T-like and a 99aa-like Type Ia. 20:48:06.875 -08:30:06.18 SN Ia 0.020127
TNS 2026opp [GOTO26fog] 01:05:49.266 -38:56:17.00 Other Featureless blue continuum. Location is consistent with the nucleus of its host galaxy. 01:05:49.266 -38:56:17.00
TNS 2026orf [ATLAS26gyw] 01:17:41.604 -35:51:10.82 SN Ia 0.096 At peak Redshift and phase from SNID-SAGE. 01:17:41.604 -35:51:10.82 SN Ia 0.096

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