DRAFT
2023-10-25 16:02:20
Type: Object/s-Discovery/Classification
Bibcode: 2023TNSAN.279....1W
ePESSTO+ spectroscopic classification of optical transients
Authors: B. Warwick (Warwick), T. Pessi (UDP), M. Pursiainen, A. Kumar, A. Sahu, D. O’Neill, D. Coppejans, J. Lyman, K. Ackley, M. Magee (Warwick), C. Gutierrez (IEEC/ICE-CSIC), M. Fulton, S. Srivastav (QUB), S. Taubenberger (MPA), S. Benetti (INAF-OAPd), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (ICE), M. Nicholl (QUB), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), K. W. Smith, S. J. Smartt, O. McBrien, D. R. Young (QUB), D. E. Wright (Univ. of Minnesota), J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes the classifications of 3 Type Ia, 1 Type Ia-91T, 3 Type II supernovae and 1 unclassified event. The SN2023xcb has an usual Ha P-Cygni profile. The lightcurve appears to show an unusually strong, long lasting peak before settling onto the plateau. Pan-STARRS detections show precursor activity approximately one year before explosion. AT2023uln has a blue featureless continuum, with unknown redshift.

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 2020arXiv200309052S), the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the ALeRCE broker (Forster et al. 2020 https://arxiv.org/abs/2008.03303), the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014 2014ApJ...788...48S)

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2023 Oct 24, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B).

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 2023tvj [ATLAS23tje] 06:08:57.123 -21:31:20.05 SN II 0.04 Good match to type II supernova from SNID, Redshift from narrow host galaxy emission lines. 06:08:57.120 -21:31:20.06 SN II 0.04
TNS 2023ver [PS23jmw] 03:51:40.274 -00:30:38.95 SN Ia-91T-like 0.03 Good match to type Ia-91T-like 03:51:40.274 -00:30:38.95 SN Ia-91T-like 0.03
TNS 2022xcb [PS22jxt] 05:00:05.470 -23:55:00.10 SN II 0.04 Matches with Type II with SNID. Unusual Ha P-Cygni profile. Lightcurve appears to show unusually strong, long lasting peak before settling onto plateau. PS precursory activity ~1 year before explosion. 05:00:05.470 -23:55:00.10 SN II 0.04
TNS 2023vdr [ZTF23abjhmmw] 02:29:39.347 +03:43:33.03 SN Ia 0.132 Type Ia, Redshift based on interstellar NaD and Ca H&K lines. 02:29:39.347 +03:43:33.03 SN Ia 0.132
TNS 2023vhl [ATLAS23uil] 19:21:42.683 -56:33:04.58 SN II 0.03 Young type II. Blue continuum with narrow Ha and Hb Balmer lines 19:21:42.683 -56:33:04.58 SN II 0.03
TNS 2023utb [ASASSN-23hc] 03:06:36.228 -72:58:17.31 SN Ia 0.032 WISEA J030637.87-725816.7 0.032409 Ia. Redshift from host galaxy of 0.032. 03:06:36.228 -72:58:17.31 SN Ia 0.032
TNS 2023nqn [ATLAS23phi] 01:35:40.650 -36:09:53.20 SN Ia 0.016 Host redshift 0.016. 01:35:40.650 -36:09:53.20 SN Ia 0.016
TNS 2023uln [ATLAS23twh] 03:03:05.524 -34:44:43.52 Other Blue featureless continuum. 03:03:05.524 -34:44:43.52 SN II 0.05

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