DRAFT
2025-08-10 12:24:44
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.249....1D
ePESSTO+ spectroscopic classification of optical transients
Authors: J. N. D. van Dalen (Radboud), D. B. Malesani (DAWN/NBI Radboud), G. Corcoran (UCD) , L. Cotter (UCD), A. Martin-Carrillo (UCD), L. Galbany (IEEC-CSIC), T. Petrushevska (Nova Gorica), S. Srivastav (Oxford), O. Yaron (Weizmann), C. Gutiérrez (IEEC-CSIC), J. Anderson (ESO), T. Müller Bravo (Southampton), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (QUB), 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), H. Stevance (Oxford), M. Fulton, M. McCollum, T. Moore, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard), E. Zimmerman (Weizmann)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes a classification of 1 Type Ia, a reclassification of 1 Type II and a featureless blue continuum.

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 (Smith, Williams, Young et al. 2019 2019RNAAS...3...26S) 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 2025 August 7, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B)  and NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H).

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 Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025sax 03:54:36.800 -26:53:37.36 SN Ia 0.078 03:54:36.805 -26:53:37.56 SN Ia 0.078
TNS 2025tgl 02:40:44.203 +10:08:51.37 0.027 0.027 Featureless blue continuum with redshift derived from the host. 02:40:44.211 +10:08:51.36 SN II 0.026755
TNS 2025ruw 20:45:09.312 +23:23:53.20 SN II 0.072 20:45:09.312 +23:23:53.20 SN IIn 0.072

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