DRAFT
2025-07-18 14:48:15
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.219....1C
NTT spectroscopic classifications of optical transients during the ESO Summer Research Programme
Authors: G. Csoernyei, M. Mirabile, M. Vioque (ESO), G. Fernandes Goncalves (Federal University of Technology), L. Hauer (University of Vienna), P. M. Lequizamon Pineda (Università degli Studi di Padova), A. Moore (University College Cork), E. Nilson (Lund University), A. Pisapia (INAF-OAS), J. Willingham (Macquarie University)
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 3 new Type II SNe and a reclassification of a supernova as Type II, which were done through observations taken in the course of the ESO Summer Research Programme. We encourage follow-up observations.

The participants of the ESO Summer Research School report the following supernova classifications. The reductions were performed using the PESSTO pipeline (Public ESO Spectroscopic Survey for Transient Objects,Smartt et al. 2015 2015A&A...579A..40S).

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 by the ALeRCE broker (Forster et al. 2020, 2021AJ....161..242F), 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 July 16, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution).

This work is based on observations collected during the ESO Summer Research Programme 2025, conducted under Director's Discretionary Time, under Programme 115.29FM.001. The raw data is openly available in the ESO archive.

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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 2025pld [ATLAS25gqz] 22:09:55.635 -34:57:42.10 SN II 0.03 ATLAS 15 - 18 d The spectrum displays broad P Cygni profiles of hydrogen, along with normal metal-line blanketing at bluer wavelengths, indicating this is a Type II supernova a few weeks after explosion. GELATO finds a good match with the spectrum 1995ad at a phase of 12 days post explosion -- which phase is a week younger than what is suggested by the ATLAS light curve. The redshift is estimated to be z = 0.03 based on the template matching. 22:09:55.635 -34:57:42.10 SN II 0.03
TNS 2025qpa [GOTO25eqg] 15:59:37.630 +15:18:37.11 SN II 0.038 SDSS J155937.6+151841.2 0.038 ATLAS 9 - 12 d Strong host galaxy contamination. The spectrum shows a broad H alpha profile, indicating it to be Type II supernova, about 10 days after explosion. The redshift was taken from SDSS, and was verified by the host galaxy narrow emission lines seen in the spectrum. 15:59:37.633 +15:18:37.35 SN II 0.038
TNS 2025qzz [ATLAS25hod] 00:41:57.078 -47:54:40.14 SN II 0.04794 ESO 194-G028 0.04794 ATLAS 7 - 10 d The supernova shows broad signatures of H and He, indicating that it is a young Type II supernova. Redshift adopted from NED. 00:41:57.078 -47:54:40.14 SN II 0.04794
TNS 2025lzu [ATLAS25fob] 21:39:55.024 +06:00:12.08 SN II 0.063 SDSS J213955.08+060013.0 ATLAS ~50 d The spectrum shows a developed and broad P Cygni feature of hydrogen, indicating this is a Type II supernova. The previous spectrum of this object was featureless. The redshift is based on the narrow host galaxy H alpha line seen in the spectrum. 21:39:55.024 +06:00:12.08 SN II 0.063
File Comments
tAT2025pld_20250716_Gr13_Free_slit1.0_1_f_0.fits Quick-reduction spectrum
tAT2025qpa_20250716_Gr13_Free_slit1.0_1_f_0.fits Quick-reduction spectrum
tAT2025qzz_20250716_Gr13_Free_slit1.0_1_f_0.fits Quick-reduction spectrum
tSN2025lzu_20250716_Gr13_Free_slit1.0_1_f_0.fits Quick-reduction spectrum

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