AstroNote 2020-265

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2020-12-24 15:11:09
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: P. Pessi (ESO), C. Gutierrez (Turku), S. Yang, T.-W. Chen (Stockholm), S. Prentice (TCD), J. Anderson (ESO), T. Muller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith, S. J. Smartt, O. McBrien, S. Srivastav (QUB)
Source Group: ePESSTO+
This report includes classifications of 3 Type Ia's and 1 Type II.

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).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2020 December 23, 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 (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
TNS2020acmi [ZTF20acxcxkz]03:38:40.230-27:11:48.63SN Ia0.055WISEA J033840.45-271150.1ZTF-3 to +3Redshift measured from the narrow host galaxy H-alpha. Based on the redshift, the measured Si II line velocity is approximately 10400 km/s.03:38:40.232-27:11:48.70SN Ia0.055
TNS2020acqy [ATLAS20bihj]03:24:24.540-43:29:39.98SN Ia0.073ATLAS-3 to +3Redshift from SNID. Based on the redshift, the measured Si II line velocity is approximately 10600 km/s.03:24:24.540-43:29:39.98SN Ia0.073
TNS2020acup [ATLAS20bild]23:32:43.694-22:55:45.16SN II0.049ATLAS+4 to +7Redshift from SNID23:32:43.694-22:55:45.16SN II0.049
TNS2020adgc [ATLAS20birg]02:47:36.999-28:26:54.36SN Ia0.0422dFGRS TGS235Z0750.0425ATLAS-3 to +3Based on the redshift, the measured Si II line velocity is approximately 11600 km/s.02:47:36.999-28:26:54.36SN Ia0.042