DRAFT
2025-05-02 16:50:07
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.134....1C
ePESSTO+ spectroscopic classification of optical transients
Authors: C. Casanueva (PUC), B. Ayala (UNAB), R. Dastidar (UNAB), A. Kumar (RHUL), Thallis de L. Pessi (ESO), S. Srivastav (Oxford), G. Pignata (UTA), P. Wiseman (Southampton), M. Pursiainen (Warwick), A. Horowicz (Weizmann), 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, 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), 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 2 Type II's, 1 Type Ia, 1 AGN, and 1 CV. We encourage follow-up 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 Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), 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) and by 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 May 01, using EFOSC2 and Grisms 11 (3380-7520A, 16A resolution) and 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H).

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 2025iew [GOTO25ccb] 13:15:57.992 +17:09:56.47 SN II 0.023 -5 See Classification Report No. 20908 (2025TNSCR1560....1M) for the previous spectrum and classification. 13:15:57.992 +17:09:56.47 SN II 0.023
TNS 2025hnt [GOTO25bxa] 13:52:01.808 +15:40:05.07 SN Ia 0.05 +4 Redshift and phase are from spectral matching with SNID. See also Classification Report No. 20928 (2025TNSCR1618....1R). 13:52:01.795 +15:40:05.16 SN Ia 0.05
TNS 2023aece [PS23nwo] 15:53:44.143 -14:44:19.73 AGN 0.34 Likely an AGN: spectrum exhibiting broad H_beta, H_gamma, Mg II; narrow [O III]; blue Balmer bump. The light curve shows a variable and long rise. 15:53:44.143 -14:44:19.73 AGN 0.34
TNS 2025ebh [ZTF25aaguyai] 12:08:16.935 -11:23:00.06 SN II 0.13 Post-peak Redshift and phase are from spectral matching with SNID. See also Classification Report No. 20931 (2025TNSCR1617....1K). 12:08:16.935 -11:23:00.06 SN II 0.13
TNS 2025igx [ZTF25aanzrcx] 20:09:27.298 +10:44:32.17 CV Likely a CV: featureless spectrum; rapid rise; no host; Galactic plane. 20:09:27.298 +10:44:32.17 CV

Comments