DRAFT
2025-08-26 18:29:30
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.268....1G
ePESSTO+ spectroscopic classification of optical transients
Authors: C. Gutiérrez, R. Sanfeliu, H-Y. Miao, L. Galbany (ICE-CSIC/IEEC), A. Aryan (Taiwan), T. Kravstov (Turku), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Stockholm), O. Yaron, A. Horowicz (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), 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)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 3 Type Ia's.

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), 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 2025 Aug 25, 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 Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025tfz [ZTF25abghcmh] 16:25:37.489 +10:19:29.20 SN Ia 0.123 Redshift from spectral matching, verified by host lines 16:25:37.489 +10:19:29.20 SN Ia 0.123
TNS 2025tml [ATLAS25jgc] 06:44:33.936 -36:56:35.02 SN Ia 0.03 Redshift from spectral matching 06:44:33.936 -36:56:35.02 SN Ia 0.03
TNS 2025tsw [ZTF25abikgia] 02:11:25.850 -17:45:47.97 SN Ia 0.065 Redshift from spectral matching 02:11:25.850 -17:45:47.97 SN Ia 0.065
File Comments
tAT2025tsw_20250825_Gr13_Free_slit1.0_1_f_0.asci
tAT2025tml_20250825_Gr13_Free_slit1.0_1_f_0.asci
tAT2025tfz_20250825_Gr13_Free_slit1.0_1_f_0.asci

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