DRAFT
2025-04-06 18:17:53
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Ghendrih, C. Duffy, A. Milligan, M. Smith (Lancaster), C. Angus (QUB), P. J. Pessi (Stockholm), L. Galbany (ICE-CSIC), A. Kumar (Warwick), J. Sollerman (Stockholm), O. Yaron (Weizmann), M. Gromadzki (Warsaw), J. Anderson (ESO), T.-W. Chen (NCU), 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 7 Type Ia's, 1 Type II, an AGN and a spectrum of a likely SN where strong galaxy emission inhibits a definitive classification. 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 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 05, 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 2025fhn [ATLAS25cxo] 04:28:39.648 -18:41:26.63 SN Ia 0.07 0.069611 +4 to +7 Redshift of host galaxy obtained from NED 04:28:39.648 -18:41:26.63 SN Ia 0.07
TNS 2024aelk [PS24muv] 12:29:14.688 +25:41:18.81 AGN 0.12 Redshift derived from galaxy emission lines present in spectrum. Spectrum exhibits FeII and HeI emission features 12:29:14.688 +25:41:18.81 AGN 0.12
TNS 2025gjo [ATLAS25dli] 13:13:25.313 +24:14:40.92 SN Ia 0.025 -4 to -7 Redshift derived from template fitting using SNID 13:13:25.303 +24:14:40.82 SN Ia 0.025
TNS 2025esp [ZTF25aajdsux] 12:21:14.732 -02:51:43.74 SN 0.071 SDSS J122114.74-025143.8 Noisy spectrum, possibly exhibiting narrow He I emissions, but without enough information to classify the transient (M_abs~-19) securely. Redshift derived from galaxy emission lines present in spectrum. 12:21:14.732 -02:51:43.74 SN 0.071
TNS 2025fhs [ATLAS25cyd] 13:30:13.647 -27:06:01.36 SN Ia 0.042 -3 to +3 Redshift derived from template fitting using SNID 13:30:13.647 -27:06:01.36 SN Ia 0.042
TNS 2025ghe [ATLAS25djm] 13:45:29.877 -41:24:10.94 SN Ia 0.04 -3 to +3 Redshift derived from galaxy emission lines present in spectrum 13:45:29.877 -41:24:10.94 SN Ia 0.04
TNS 2025bfa [ATLAS25bnw] 13:54:31.807 -53:18:44.32 SN II 0.012 0.012535 > +20 Redshift of host galaxy obtained from NED 13:54:31.807 -53:18:44.32 SN II 0.012
TNS 2025evb [ZTF25aajitmc] 15:22:40.301 +09:15:05.79 SN Ia 0.077 SDSS J152240.47+091459.5 0.0765463 -3 to +3 Redshift of host galaxy obtained from NED 15:22:40.301 +09:15:05.79 SN Ia 0.077
TNS 2025fbu [ZTF25aajrlbu] 15:53:45.286 -01:24:31.25 SN Ia-91T-like 0.058 0.0628 -7 to -4 Redshift derived from galaxy emission lines present in spectrum 15:53:45.284 -01:24:31.43 SN Ia-91T-like 0.058
TNS 2025fbt [ZTF25aajixgi] 17:22:34.407 +12:23:07.93 SN Ia 0.085 -3 to +3 Redshift derived from template fitting using SNID 17:22:34.407 +12:23:07.93 SN Ia 0.085

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