DRAFT
2025-02-08 16:23:52
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..51....1G
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Gillanders (Oxford), D. Magill, M. Fulton, S. Srivastav (Oxford), T. de Lourenco Pessi (ESO), P. Pessi (Stockholm), D. O'Neill (Warwick), T.-W. Chen (NCU), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), A. Horowicz, O. Yaron, E. Zimmerman (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), C. Angus, A. Aamer, K. W. Smith, 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(QUB), P. Ramsden (QUB/Birmingham)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 3 SNe Ia, 1 SN II, 1 SN IIb and 1 Galaxy. AT2025ayw is probably a CV, given the blue spectrum without any broad SN-like features, no obvious host galaxy and low Galactic latitude.

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), 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 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 February 07, 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 2025amm [ZTF25aadhuav] 03:03:50.763 +12:04:13.51 SN Ia 0.032 +3 to +7 Reddened SN Ia close to galaxy core, redshift from narrow emission from host galaxy 03:03:50.763 +12:04:13.51 SN Ia 0.032
TNS 2025ats [ATLAS25bhf] 11:55:43.777 -14:49:54.36 SN II 0.04 WISEA J115544.43-144958.9 0.040218 at max Redshift from NED 11:55:43.777 -14:49:55.10 SN II 0.04
TNS 2025ayw [ATLAS25blp] 16:23:09.291 -76:54:30.14 CV 0 Blue continuum, no obvious broad features, no apparent host, ~ 19 degrees Galactic latitude. This is probably a foreground CV. 16:23:09.291 -76:54:30.14 CV
TNS 2025azl [GOTO25acy] 13:03:55.876 -20:56:32.55 SN IIb 0.02 Largish offset from a galaxy, redshift is uncertain (inferred from SNID and Gelato) 13:03:55.883 -20:56:32.38 SN IIb 0.02
TNS 2025bag [PS25ny] 10:18:27.296 -26:43:58.46 SN Ia 0.032 2MASX J10182722-2643567 0.030905 -10 to -7 Redshift from narrow emission lines from host galaxy 10:18:27.296 -26:43:58.46 SN Ia 0.032
TNS 2025bah [PS25nz] 10:11:07.175 -21:22:28.41 Galaxy 0.171 10:11:07.175 -21:22:28.41 Galaxy 0.171
TNS 2025bar [GOTO25aeb] 11:22:43.661 -45:34:28.58 SN Ia 0.16 at max In the skymap of GW event S250206dm, redshift from SNID 11:22:43.661 -45:34:28.58 SN Ia 0.16

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