DRAFT
2023-05-22 15:30:54
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Terwel, L. Harvey (TCD), I. Mandel (Monash University), K. Maguire, G. Dimitriadis, U. Burgaz (TCD), C. Gutiérrez (UTU), T. Killestein (Warwick), M. Dennefeld (IAP/Paris & Sorbonne), M. Magee (Warwick), I. Arcavi (Tel Aviv), S. Benetti (INAF - OAPd), C. Frohmaier, P. Wiseman (Southampton), P. Chen (Weizmann), N. Ihanec (Warsaw), J. Anderson (ESO), T.-W. Chen (TUM/MPA), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (ICE), M. Nicholl (QUB), O. Yaron (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+
Abstract:
This report includes classifications of 6 Type Ia's (including 2 91T-like Type Ia's and 1 transitional 86G-like Type Ia), 1 SN, 1 QSO and 3 stellar transients. AT2023hpa was not visible on the acquisition image. SN 2023iwy's spectral type is unclear, with potential spectral matches including Type II, 00cx-like Type Ia and SLSN. 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 2020arXiv200309052S) and 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).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2023 May 21, 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.

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 2023iwn [ATLAS23ktn] 11:32:27.524 -32:27:13.79 QSO 1.525 Redshift derived from host galaxy lines present in the spectrum 11:32:27.524 -32:27:13.79 QSO 1.525
TNS 2023iwr [ATLAS23kuz] 11:33:45.225 -23:38:22.84 SN Ia 0.065 -3 to +3 Redshift derived from spectral matching 11:33:45.225 -23:38:22.84 SN Ia 0.065
TNS 2023isp [ZTF23aajauud] 17:07:50.318 -07:32:48.53 Varstar 0 17:07:50.318 -07:32:48.53 Varstar
TNS 2023iwo [ATLAS23kub] 15:58:22.793 +17:08:31.29 SN Ia 0.091 -7 to -4 Redshift obtained from NED 15:58:22.793 +17:08:31.29 SN Ia 0.091
TNS 2023jah [ATLAS23kws] 20:31:09.277 -44:15:44.77 SN Ia-91bg-like 0.03 -3 to +3 Redshift obtained from NED. Good matches with the transitional SN 1986G 20:31:09.277 -44:15:44.77 SN Ia-91bg-like 0.03
TNS 2023ixy [ZTF23aajkejg] 17:26:20.708 +23:39:44.93 SN Ia-91T-like 0.11 SDSS J172620.67+233944.9 -3 to +3 Redshift derived from spectral matching 17:26:20.711 +23:39:45.09 SN Ia-91T-like 0.11
TNS 2023iwy [ZTF23aakmewi] 18:00:18.621 +26:24:32.02 SN 0.02 Unclear classification. The host appears to be a low-luminosity galaxy east of the transient, seen in deep-stack ATLAS and Legacy images. Reasonable spectral matches include Type II SN, 00cx-like Type Ia SN and SLSN at z ~ 0.02 18:00:18.622 +26:24:32.04 SN Ic-BL 0.03
TNS 2023jbe [ATLAS23kzj] 20:10:58.769 -56:42:50.88 SN Ia 0.052 -3 to +3 Redshift derived from host galaxy spectrum present in the slit 20:10:58.769 -56:42:50.88 SN Ia 0.052
TNS 2023jao [ATLAS23kxz] 19:57:23.715 -49:09:50.72 CV 0 19:57:23.715 -49:09:50.72 CV
TNS 2023jal [ATLAS23kxi] 18:55:13.256 -69:29:24.86 CV 0 18:55:13.256 -69:29:24.86 CV
TNS 2023irq [ATLAS23knt] 22:22:44.906 -15:42:16.65 SN Ia-91T-like 0.06 -7 to -4 Redshift derived from spectral matching 22:22:44.904 -15:42:16.61 SN Ia-91T-like 0.06
TNS 2023hpa 07:46:16.872 +18:22:36.84 Other LSBC F560-04 0.0526 Target was not visible on acquisition image 07:46:16.872 +18:22:36.84

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