DRAFT
2025-05-31 14:34:17
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: C. F. Aster (Cardiff), S. P. Cosentino (University of Catania), T. Petrushevska (Nova Gorica), A. Reguitti (INAF, IT), L. Galbany (ICE-CSIC), A. Aryan, Y.-H. Lee, C.-H. Lai, M.-H. Lee, T.-W. Chen (NCU, Taiwan), J. Anderson (ESO), T. Müller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), P. J. Pessi (Stockholm), O. Yaron (Weizmann), D. R. 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), 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)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 1 Type 1a, 1 Type Ia-91T-like, 1 Type II, and 1 Type Ic. 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), 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 May 30, using EFOSC2 with Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H) and DASH (Muthukrishna et al. 2019 2019ApJ...885...85M ).

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 2025lxm [ZTF25aarnyuv] 12:03:56.026 +20:25:50.53 SN Ia-91bg-like 0.022 LEDA 3089972 0.0218283 Around peak Already classified by Desai et al. 2025, TNSCR 21198. 12:03:56.026 +20:25:50.53 SN Ia-91bg-like 0.022
TNS 2025mgx [ZTF25aarxgcb] 16:11:12.837 +29:31:48.83 SN Ic 0.091 SDSS J161113.08+293148.8 0.0907887 Around peak Possibly associated with host WISEA J161113.08+293149.2. Redshift from host. Good match with Type Ic using DASH and NGSF. 16:11:12.837 +29:31:48.83 SN Ic 0.091
TNS 2025kne [ATLAS25ezd] 13:41:02.619 +14:54:05.16 SN II 0.042 WISEA J134201.55+145404.7 Previously classified as an SN in Cosentino et al. 2025, AstroNote 2025-150. We took the other spectrum on May 29th 2025, and it showed prominent H-features matching nicely with Type II SNe from NGSF, so we update the classification. 13:41:02.619 +14:54:05.16 SN II 0.042
TNS 2025mlr [ATLAS25fsx] 23:22:27.449 -38:57:03.83 SN Ia 0.11 GALEXASC J232227.42-385701.9 Post peak Good match with Type Ia using NGSF. Redshift from template match using NGSF. 23:22:27.449 -38:57:03.83 SN Ia 0.11
AstroNote Publication Timestamp Title Authors
2025-150 2025-05-20 17:49:32 ePESSTO+ spectroscopic classification of optical transients S. P. Cosentino (University of Catania), C. F. Aster (Cardiff), E. Concepcion (Nova Gorica), S. Faris (Tel Aviv), M. Dennefeld (IAP), A. Aryan, T.-W. Chen, Y.-H. Lee, C.-H. Lai, M.-H. Lee, J.-L. Yang (NCU, Taiwan), J. Anderson (ESO), T. Müller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), P. J. Pessi (Stockholm), O. Yaron (Weizmann), D. R. 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), 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)

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