DRAFT
2023-11-27 14:11:36
Type: Object/s-Discovery/Classification
Bibcode: 2023TNSAN.322....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Kopsacheili, M. Gonzalez-Bañuelos (ICE), C. Gutiérrez (IEEC/ICE-CSIC), T. Killestein (UTU), M. Dennefeld (IAP), 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, R. Bruch (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), K. W. Smith, S. Srivastav, M. Fulton, M. McCollum, T. Moore, 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 3 Type Ia's, 2 Type II's, 1 Type Ic-BL, and 1 variable star.

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 Young Supernova Experiment (Pan-STARRS - see Jones et al. 2021, 2021ApJ...908..143J), the ATLAS survey (Smith et al. 2020 2020arXiv200309052S), 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 DPAC.

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2023 November 26, using EFOSC2 and Grisms 13 (3985-9315A, 18A resolution) and 11 (3380-7520, 16A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), GELATO (Harutyunyan et al. 2008 2008A&A...488..383H) 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 2023xqo [ATLAS23vnr] 09:16:57.029 -25:33:07.23 SN II 0.02 After peak Redshift from spectral match. 09:16:57.030 -25:33:06.80 SN II 0.02
TNS 2023wtq [ZTF23abochfb] 01:21:55.680 -03:46:19.96 SN Ic-BL 0.15 Around peak Redshift from spectral match. The absolute magnitude at peak is around -20. We also find reasonable matches for SLSN-I (z~0.12 or 0.14) and Ia-SC (z~0.1). 01:21:55.680 -03:46:20.10 SN Ic-BL 0.15
TNS 2023xje [ATLAS23vig] 05:38:52.978 -35:55:17.07 SN II 0.035 After peak Initially classified as SN (AstroNote 2023-304). 05:38:52.980 -35:55:16.93 SN II 0.035
TNS 2023yer [GOTO23blj] 01:21:16.694 +17:12:56.03 SN Ia 0.06 SDSS J012116.67+171253.7 Before peak Redshift from spectral match 01:21:16.700 +17:12:55.98 SN Ia 0.06
TNS 2023xwp [PS23kok] 02:42:52.980 -21:51:44.96 SN Ia 0.06 Around peak Redshift from spectral match 02:42:52.980 -21:51:44.96 SN Ia 0.06
TNS 2023xsp [ATLAS23vrj] 03:14:35.646 -61:54:48.76 SN Ia 0.06 Around peak Redshift from spectral match 03:14:35.650 -61:54:48.35 SN Ia 0.06
TNS 2023yjq [Gaia23dir] 06:21:08.690 -25:57:57.71 Varstar 06:21:08.690 -25:57:57.71 Varstar

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