AstroNote 2021-297

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DRAFT
2021-11-25 16:48:43
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: F. Ragosta (INAF-OACN), R. Carini (INAF-OAAb), L. Tartaglia, S. Benetti (INAF-OAPd), F. Onori (INAF-OAAb), S. Gonzalez-Gaitan (CENTRA, U. Lisbon), J. Anderson (ESO), T.-W. Chen (SU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (ICE), M. Nicholl (Birmingham), E. Zimmerman, O. Yaron (Weizmann), J. Sollerman (SU), 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, D. R. Young, M. Fulton (QUB), K. C. Chambers, T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA, Univ. Hawaii)
Source Group: ePESSTO+
Abstract:
This report includes classifications of 6 Type Ia's, 2 Type II and 1 Type IIn supernovae. 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 Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), 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 2021 November 24, 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) and Superfit (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
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftSourcePhase (days)RemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2021acya04:02:13.757-28:23:29.68SN IIn0.063ATLASAt maximumAt z=0.063 the transient has a peak magnidude ~-20.6 mag, in the SLSN regime. He II is also present, as in early Type II spectra showing high-ionization features. Redshift derived from Gelato/SNID template fitting.04:02:13.760-28:23:29.72SN IIn0.063
TNS2021adcw02:04:32.880-21:07:09.50SN II0.017ATLAS, ZTFAround maximumRedshift derived from narrow host emission lines02:04:32.891-21:07:09.52SN II0.017
TNS2021aefa05:48:06.624-17:32:09.21SN Ia0.11ATLAS, ZTF, PS+5Redshift derived from Gelato/SNID template fitting05:48:06.617-17:32:09.32SN Ia0.11
TNS2021aekt05:14:57.858-44:15:18.24SN Ia0.052ATLAS-2Redshift derived from narrow host emission lines05:14:57.858-44:15:18.24SN Ia0.052
TNS2021aexp01:38:11.964-29:42:04.38SN Ia0.07GALEXASCJ013811.96-294205.1ATLAS, ZTF, PS+1Redshift derived from Gelato/SNID template fitting01:38:11.964-29:42:04.38SN Ia0.07
TNS2021aexy03:15:53.847-23:02:41.36SN Ia0.039OrphanATLAS, ZTF, PS1at maximumAlready classified as a Type Ia (TNS Classification Report No. 11433), we confirm the classification03:15:53.845-23:02:41.31SN Ia0.039
TNS2021afdu00:08:43.248-39:52:40.06SN Ia0.0642MASXJ00084328-39524040.058344ATLAS-10Redshift derived from Gelato/SNID template fitting00:08:43.248-39:52:40.06SN Ia0.064
TNS2021aebs01:24:25.700+19:01:19.95SN II0.036ATLAS, PS1+15 (expl)See 2021TNSCR3871. Redshift derived from Gelato/SNID template fitting01:24:25.700+19:01:19.85SN II0.036
TNS2021aekz03:34:15.514-41:28:26.56SN Ia0.062ATLAS+12Redshift derived from narrow host emission lines03:34:15.514-41:28:26.56SN Ia0.062