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...3a..26S) and by the ALeRCE broker (Forster et al. 2020 https://arxiv.org/abs/2008.03303), the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD), and by the ESA Gaia Photometric Science Alerts Team (Hodgkin et al. 2021 2021A&A...652A..76H)
Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2023 December 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.
| 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 | 2016fkq [PS16dzd] | 22:22:21.876 | -23:30:24.52 | AGN | 0.18 | Redshift from template matching. | 22:22:21.880 | -23:30:24.59 | AGN | 0.18 | ||||
| TNS | 2023yyr [PS23lit] | 01:28:23.371 | -05:13:53.02 | SN Ia | 0.1 | Post-max | Redshift from template matching. | 01:28:23.371 | -05:13:53.02 | SN Ia | 0.1 | |||
| TNS | 2023ypt [Gaia23dkx] | 02:03:54.020 | -09:24:52.74 | AGN | 0.214 | 0.214 | Redshift from host galaxy. | 02:03:54.020 | -09:24:52.74 | AGN | 0.214 | |||
| TNS | 2023xbu [ZTF22abveoak] | 03:55:57.939 | -16:24:45.56 | AGN | 0.104 | 0.104 | Redshift from host galaxy. The light curve of AT2023xbu has demonstrated flaring episodes in the past, including in 2020 and 2022. The current spectrum shows broad Balmer and narrow [O III] lines, and is therefore similar to AGN. However, the spectrum shows excess flux in the blue, with a clear upturn below 4500 AA, He I 5876, and He II 4686. It is therefore possible that this flaring event is consistent with a TDE, which is possibly repeating. | 03:55:57.939 | -16:24:45.56 | AGN | 0.104 | |||
| TNS | 2023ynf [Gaia23dja] | 07:12:18.960 | -34:22:46.60 | SN IIn | 0.04 | Post-max | Redshift based on tempalte matching. SNID provides matches to SNe IIn | 07:12:18.960 | -34:22:46.60 | SN IIn | 0.04 | |||
| TNS | 2023ynm [Gaia23djp] | 04:58:34.590 | -34:39:55.19 | Other | 0.14 | Redshift from template matching. The spectrum shows narrow galaxy lines at z=0.14. The spectrum also shows possible signs of broad H and He emission at a lower redshift of z = 0.12 that are consistent with some SNe II. At this redshift however, the implied absolute magnitude is M ~ -20, which is significantly brighter than normal SNe II. | 04:58:34.590 | -34:39:55.19 | 0.14 | |||||
| TNS | 2023ytn [GOTO23bnj] | 08:44:43.134 | -05:28:16.12 | SN Ia | 0.031 | 0.031 | Max | Redshift from host galaxy. | 08:44:43.100 | -05:28:15.87 | SN Ia | 0.031 |
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