DRAFT
2025-01-23 16:15:26
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: H. Wichern, S. de Wet, G. Leloudas (DTU Space), S. Faris (TAU), T. Pessi (ESO), G. Pignata (UTA), M. Magee (Warwick), I. Arcavi (TAU), G. Dimitriadis (Lancaster), J. Sollerman (OKC), S. Benetti (INAF-OAPd), 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 (Weizmann), D. Young (QUB)
Source Group: ePESSTO+
Abstract:
This report includes classifications of 1 faint Type Iax, 1 Type Ic, one possible SLSN and one AGN.

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 Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD) and by the BlackGEMtelescope array (Groot et al. 2024, PASP, 136, 115003 2024PASP..136k5003G).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2025 January 22, using EFOSC2 and Grism 11 (3380 - 7520A, 13A 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 Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025iv [GOTO25ft] 02:07:27.254 +19:11:36.68 SN Ic 0.0173 Spectrum with significant host contamination. After removing the host emission lines, the continuum gives good matches with SNe Ic and Ic-BL. 02:07:27.256 +19:11:36.88 SN Ic 0.0173
TNS 2025zi [BGEM J033854.58-262214.6] 03:38:54.586 -26:22:14.65 SN Iax[02cx-like] 0.0046 Very faint SN Iax, currently at q = 19.3 mag, possibly rising. The approximate absolute magnitude is M = - 12.2 mag 03:38:54.586 -26:22:14.65 SN Iax[02cx-like] 0.0046
TNS 2025qw [GOTO25ji] 06:52:01.527 +27:07:22.64 AGN 0.037 Broad Ha and Hb, narrow O III, and erratic light curve. 06:52:01.447 +27:07:23.00 AGN 0.037
TNS 2024afyo [GOTO24jrm] 06:55:06.841 -39:20:21.39 SLSN-I 0.18 Orphan transient rising for 30 days. Spectral matches with superluminous supernovae at z~0.16-0.18. We classify this tentatively as SLSN-I, although we caution that the spectrum does not cover the Ha region at this redshift and therefore another luminous supernova type (e.g. SLSN-II) is possible 06:55:06.841 -39:20:21.39 SLSN-I 0.18

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