DRAFT
2025-04-05 17:25:39
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: C. Duffy, M. Ghendrih, M. Smith, G. Dimitriadis (Lancaster), C. Angus (QUB), A. Kumar (Warwick), P. J. Pessi (Stockholm), L. Galbany (ICE-CSIC), J. Sollerman (Stockholm), O. Yaron (Weizmann), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), D. R. 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), 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), K. C. Chambers, M. Huber, A. Schultz, T. de Boer, J. Bulger, J. Fairlamb, C.-C. Lin, T. Lowe, E. Magnier, P. Minguez, R. J. Wainscoat, H. Gao (IfA, Hawaii)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 4 Type Ia's, 1 Type II, 1 Type Ic and a CV

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 Pan-STARRS Survey for Transients(Chambers et al. 2016 2016arXiv161205560C), 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 (Smith, Williams, Young et al. 2019 2019RNAAS...3...26S) 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 April 04, using EFOSC2 with Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 15A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), GELATO (Harutyunyan et al. 2008 2008A&A...488..383H), Superfit (Howell et al. 2005 2005ApJ...634.1190H) 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 2025gnn [ATLAS25dmo] 10:43:37.084 +00:37:24.33 CV 0 Redshift from absorption lines present in spectrum 10:43:37.069 +00:37:24.31 SN Ia 0.08
TNS 2025gjp [ATLAS25dlj] 19:46:40.069 -25:14:25.59 SN II 0.0187 0.018743 at max Redshift of likely host galaxy obtained from NED 19:46:40.064 -25:14:25.41 SN II 0.0187
TNS 2025fdu [ZTF25aajscwm] 16:01:26.192 +05:43:23.33 SN Ia 0.046 0.045545 -3 to +3 Redshift of host galaxy obtained from NED 16:01:26.192 +05:43:23.33 SN Ia 0.045545
TNS 2025gfc [ATLAS25dir] 19:34:57.964 -70:49:43.28 SN Ia-91T-like 0.0373 -3 to +3 Redshift obtained from host galaxy absorption lines in spectrum 19:34:57.964 -70:49:43.28 SN Ia-91T-like 0.0373
TNS 2025ftn [ZTF25aakrsbo] 13:59:07.081 -03:49:48.84 SN Ia 0.051 0.051055 -7 to -4 Redshift of host galaxy obtained from NED 13:59:07.077 -03:49:48.89 SN Ia 0.051
TNS 2025glx [ATLAS25dlu] 18:28:59.923 +16:56:38.88 SN Ic 0.02 +4 to +7 18:28:59.923 +16:56:38.88 SN Ic 0.02
TNS 2025gef [PS25awd] 15:03:22.727 +10:39:20.55 SN Ia 0.04 0.040061 -7 to -4 Redshift of host galaxy obtained from NED 15:03:22.727 +10:39:20.55 SN Ia 0.04

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