AstroNote 2021-9

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2021-01-07 16:03:54
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: S. Srivastav, J. Gillanders, M. Fulton, K. W. Smith, L. J. Shingles, (QUB), S. Prentice (TCD), C. Gutierrez (Turku), S. Benetti (INAF), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), E. Zimmerman, O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry,  L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii),  B. Stalder (LSST), A. Rest (STScI), S. J. Smartt, O. McBrien (QUB)
Source Group: ePESSTO+
This report includes classifications of 5 Type Ia's, 1 Type Ia-91T, 1 Type Ib and 1 Type II. We encourage follow-up 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

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2021 January 06, 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 (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
TNS2020abtz [ATLAS20bgrb]00:24:43.218-23:21:10.06SN Ia0.13ATLAS> +20Noisy spectrum. Orphan transient, redshift acquired from SNID.00:24:43.218-23:21:10.06SN Ia0.13
TNS2020abxp [ATLAS20bhai]00:24:30.618-11:05:05.38SN Ib0.055SDSS J002430.81-110505.70.054453ATLAS+11 to +20Spectrum dominated by galaxy light, however, matches can be made with Type Ib-normal. Galaxy lines place this transient at a redshift of z = 0.055.00:24:30.620-11:05:05.36SN Ib0.055
TNS2020acvz [ZTF20acxyipy]10:42:49.782+00:52:59.10SN Ia0.13SDSS J104249.79+005258.0ZTF+11 to +20Reasonable matches with Type Ia-normal. Redshift acquired from SNID.10:42:49.787+00:52:59.11SN Ia0.13
TNS2020aeje [ATLAS20bjnj]00:17:11.959-07:37:37.44SN II0.02WISEA J001712.00-073743.7ATLAS-3 to +3Redshift acquired from SNID.00:17:11.977-07:37:37.32SN II0.02
TNS2020aeqn [ATLAS20bjty]11:27:54.836+20:51:13.14SN Ia0.06SDSS J112754.93+205121.20.059901ATLAS+11 to + 2011:27:54.836+20:51:13.14SN Ia0.06
TNS2021gi [ATLAS21abc]05:17:39.588-39:45:37.30SN Ia0.07WISEA J051739.77-394544.5ATLAS-3 to +3H-alpha (and Helium) from host imply a redshift of z = 0.07.05:17:39.588-39:45:37.30SN Ia0.07
TNS2021gj [ATLAS21abe]00:35:40.078-32:05:58.43SN Ia-91T-like0.093WISEA J003539.97-320557.90.0902ATLAS-7 to -400:35:40.078-32:05:58.43SN Ia-91T-like0.093
TNS2021go [ATLAS21abi]03:26:58.719-29:08:26.53SN Ia0.1WISEA J032658.53-290827.2ATLAS-3 to +3Shallow Si II. Redshift acquired from SNID.03:26:58.717-29:08:26.79SN Ia0.1