DRAFT
2025-02-05 16:07:23
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..47....1G
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Gillanders (Oxford), D. Magill, M. Fulton (QUB), S. Srivastav (Oxford), D. O'Neill (Warwick), T. Pessi (ESO), T.-W. Chen (NCU), S. Benetti (INAF-OAPd), J. Sollerman (OKC), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Stockholm), A. Horowicz, O. Yaron (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt (Oxford/QUB), K. W. Smith, M. McCollum, T. Moore, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (McGill), J. Sommer (LMU), A. Rest (STScI), C. Stubbs (Harvard), X. Sheng, A. Aamer, C. R. Angus, P. Ramsden (QUB/Birmingham)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 5 type Ia, 1 Ia-91T and 1 SN II. AT2025atd shows a blue continuum and no obvious broad SN features, and thus its spectral type is unclear. We encourage followup observations.

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 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 Feb 04, using EFOSC2 and Grism 13 (3985-9315A, 18A 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 2025acn [GOTO25mf] 07:40:45.743 -65:27:14.06 SN Ia 0.04 at max redshift from SNID 07:40:45.743 -65:27:14.06 SN Ia 0.04
TNS 2025aet [ATLAS25axt] 06:51:06.312 +19:46:40.33 SN Ia 0.07 at max redshift from SNID 06:51:06.312 +19:46:40.33 SN Ia 0.07
TNS 2025akf [ATLAS25bch] 02:21:32.611 -43:05:46.12 SN Ia 0.08 -7 to -3 redshift from SNID 02:21:32.611 -43:05:46.12 SN Ia 0.08
TNS 2025ali [GOTO25xo] 06:23:24.009 -65:05:42.81 SN II 0.01 redshift from SNID, very faint host 06:23:24.009 -65:05:42.81 SN II 0.01
TNS 2025apl [ATLAS25bfg] 09:36:33.388 -05:06:37.14 SN Ia 0.04 -10 to -7 redshift from SNID 09:36:33.388 -05:06:37.14 SN Ia 0.04
TNS 2025lw [GOTO25gu] 06:43:06.552 -64:15:30.90 SN Ia 0.029 ESO 087- G 036 0.02863 +10 to +20 known host redshift from NED 06:43:06.552 -64:15:30.90 SN Ia 0.029
TNS 2025ata [ATLAS25bgi] 11:14:29.247 -08:40:29.49 SN Ia-91T-like 0.1 at max redshift from SNID 11:14:29.246 -08:40:29.73 SN Ia-91T-like 0.1
TNS 2025atd [ATLAS25bgl] 04:21:08.993 -06:45:09.41 SN 0.038 WISEA J042109.26-064503.4 0.0384 noisy spectrum, blue continuum and no obvious broad features 04:21:08.997 -06:45:09.42 SN 0.038
TNS 2024ablg [ATLAS24qgc] 05:44:09.830 -51:24:40.79 SN IIP 0.052 We reclassify this transient as SN IIP based on its light curve plateau and a followup NTT spectrum that matches the SN II 2007od. 05:44:09.830 -51:24:40.79 SN IIP 0.052
TNS 2024aegq [GOTO24jcl] 05:36:48.219 -57:21:18.63 SLSN-I 0.133 We reclassify this transient as an SLSN-I based on a followup NTT spectrum and its absolute magnitude of ~-22. 05:36:48.219 -57:21:18.63 SLSN-I 0.133

Comments