DRAFT
2025-01-25 16:33:24
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..33....1W
ePESSTO+ spectroscopic classification of optical transients
Authors: S. de Wet, H. Wichern, G. Leloudas (DTU Space), S. Faris (TAU), T. Pessi (ESO), G. Pignata (UTA), S. Benetti (INAF-OAPd), M. Gonzalez-Banuelos, C. Gutiérrez (IEEC/ICE-CSIC), J. Sollerman (OKC), 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), 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, S. Srivastav, M. McCollum, T. Moore, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard), X. Sheng, A. Aamer, C. R. Angus, D. Magill (QUB), P. Ramsden (QUB/Birmingham)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 2 Type II's, 1 featureless transient of likely Galactic origin, and one re-classification of a previously blue and featureless transient to a SLSN

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 January 23, using EFOSC2 and Grisms 11 (3380 - 7520A, 13A resolution) and 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 2025yn [ATLAS25apx] 02:04:18.708 -08:44:27.50 SN II 0.017 02:04:18.708 -08:44:27.35 SN II 0.017
TNS 2024adsy [GOTO24iwu] 11:42:15.044 +19:04:14.05 SN IIP 0.024 11:42:15.027 +19:04:13.89 SN IIP 0.024
TNS 2024afzf [ATLAS24sbn] 07:32:35.255 -17:18:14.87 Other 0 Red featureless transient, in a crowded field, rising steadily for 40 days. Strong Galactic extinction and Na I D at z = 0. Correcting for extinction the SED becomes blue. Most likely a Galactic transient. 07:32:35.239 -17:18:14.52
TNS 2024afav [GOTO24jlv] 12:49:12.049 -18:06:12.62 SLSN-I 0.072 Re-classification of object that was previously blue and featureless. Now consistent with a SLSN at z = 0.072. 12:49:12.050 -18:06:12.61 SLSN-I 0.072

Comments

Giorgos
Leloudas

Fri, 01/24/2025 - 15:08