DRAFT
2021-04-18 18:50:34
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Dennefeld (IAP), C. Vogl, G. Csoernyei, A. Holas, S. Taubenberger (MPA), A. Floers (GSI), R. Carini (INAF Roma), C. Gutierrez (Turku), T.-W. Chen (Stockholm), S. Benetti (INAF Padova), J. Anderson (ESO), T. Müller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith, S. J. Smartt, J. Gillanders, O. McBrien, S. Srivastav (QUB), S. Yang (Stockholm), Y.-C. Pan, C.-C. Ngeow, H.-Y. Hsiao, C.-S. Lin, W.-J. Hou and J.-K. Guo (IANCU)
Source Group: ePESSTO+
Abstract:
This report includes classifications of two Type Ia's, two Type II's, and one peculiar Type II. The peculiar Type II SN 2021hqe is similar to SN 1987A around three weeks after explosion.

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), 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), and by MASTER (see http://observ.pereplet.ru/ ; Lipunov et al. 2004, AN, 325, 580).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2021 April 17, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H).

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 2021iex [ZTF21aarlqgt] 08:58:39.329 +12:18:51.44 SN II 0.067 SDSS J085838.95+121848.2 0.067 ZTF, ATLAS +11 to +20 Redshift from narrow host galaxy H-alpha. We estimate a phase of around 16 d after explosion from the ZTF light curve. 08:58:39.329 +12:18:51.44 SN II 0.067
TNS 2021jlr [ZTF21aatvqcl] 09:17:23.769 +25:48:17.59 SN II 0.029 SDSS J091723.60+254815.9 0.029 ZTF, ATLAS +8 to +10 Redshift from narrow host galaxy emission lines. We estimate a phase of around 9 d after explosion from the ZTF light curve. 09:17:23.780 +25:48:17.53 SN II 0.029
TNS 2021hqe [ATLAS21jmk] 09:41:30.962 +10:38:22.96 SN II-pec 0.0185 CGCG 063-042 0.0185 ATLAS, ZTF > +20 Redshift from known host. GELATO finds a good match with SN 1987A at 22.7 d after explosion. This identification is consistent with the photometric data from ZTF and ATLAS. The object has also been followed as a part of the Kinder survey (AstroNote #2021-92) using the 0.4m-SLT at the Lulin Observatory. On 2021-04-06 (MJD = 59310.54), host-subtracted photometry yielded g = 19.99 +/- 0.07, r = 19.54 +/- 0.06 and i = 19.52 +/- 0.15 mag for the supernova. 09:41:30.959 +10:38:22.83 SN II-pec 0.0185
TNS 2021jvi [ATLAS21mwk] 10:23:54.735 -30:10:55.07 SN Ia 0.0672 6dFGS gJ102354.6-301055 0.0672 ATLAS –3 to +3 Redshift from known host. 10:23:54.735 -30:10:55.07 SN Ia 0.0672
TNS 2021gbs [MASTER OT J203331.31-243730.1] 20:33:31.328 -24:37:30.75 SN Ia 0.0248 ESO 528- G 018 0.0248 MASTER, ATLAS > +20 Redshift from known host. SNID finds a good match with SN 2005cf at 47 d after B-band maximum. 20:33:31.320 -24:37:30.58 SN Ia 0.0248

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