DRAFT
2021-11-26 15:04:30
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN.298....1R
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), T. Killestein (Warwick), J. Teffs (LJMU), J. Anderson (ESO), T.-W. Chen, J. Sollerman (SU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (ICE), M. Nicholl (Birmingham), E. Zimmerman, 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)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 1 Type Ia-91T and 2 Type II 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 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 25, 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
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 2021aexi 23:51:22.335 +20:06:34.90 SN Ic 0.014 NGC 7771 0.01446 ATLAS, ZTF Around maximum Redshift from NED. To match the continuum we assumed E(B-V)=0.5 mag. This corresponds to a peak absolute magnitude -16.7 mag, consistent with a Type Ic 23:51:22.335 +20:06:34.90 SN Ic 0.014
TNS 2021afis 01:06:25.371 +14:34:26.48 SN Ia-91T-like 0.04 SDSS J010625.67+143416.8 0.04033 ATLAS Pre maximum Redshift from NED. 01:06:25.399 +14:34:26.35 SN Ia-91T-like 0.04
TNS 2021afdx 00:37:42.580 -33:43:25.28 SN II 0.03 ESO350-G040 0.030187 ATLAS Around maximum Redshift from NED. Similar to SN 2008aq, might evolve in a Type IIb 00:37:42.580 -33:43:25.28 SN II 0.03
TNS 2021afiq 09:51:34.848 -11:38:44.24 SN II 0.076 ATLAS Pre maximum Young Type II showing high-ionisation features. Redshift derived from narrow Halpha emission line. The transient is possibly associated with 94021478946265516; an r=20.26 mag galaxy found in the PS1 catalogue. 09:51:34.800 -11:38:44.95 SN II 0.076

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