AstroNote 2020-222

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2020-11-07 16:21:24
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: Emma Callis (UCD), Nada Ihanec, Mariusz Gromadzki (Warsaw), Morgan Fraser (UCD), Cristina Barbarino (Stockholm), Priscila Pessi (ESO), Eleonora Parrag (Cardiff), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), 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,
Source Group: ePESSTO+
This report includes classifications of 2 Type Ia's, 1 Type IIn, and 2 transients with a blue continuum. AT2020yxf has tentative detection of an emission feature at 6563A, potentially consistent with a CV. AT2020yzo is blue and featureless, with possible detection of high ionisation lines sometimes seen in SNe

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 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), the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014 2014ApJ...788...48S), and by the ESA Gaia Photometric Science Alerts Team DPAC.

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2020 November 06, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B). 

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
TNS2020yxo [ZTF18abrfccm]01:47:27.121+00:58:03.50SN Ia0.1at maxRedshift from SNID match.01:47:27.121+00:58:03.50SN Ia0.1
TNS2020yeo [ATLAS20berj]04:23:56.864+04:30:51.39SN Ia0.03at maxRedshift from SNID match04:23:56.862+04:30:51.41SN Ia0.03
TNS2020xpo [ATLAS20berk]02:32:25.664-12:57:41.01SN IIn0.075GALEXASC J023225.46-125741.7Redshift measured from emission lines. Abs mag -18.802:32:25.664-12:57:41.01SN IIn0.075
TNS2020yzo [ASASSN-20nu]06:43:32.004-72:35:25.51SN IIESO 034- G 0120.018503Blue and featureless, very young Type II SN. Possible weak features around 4500 Ang that may be high ionization lines sometimes seen in SNe <1 day from explosion.06:43:32.150-72:35:25.33SN II0.0185
TNS2020yxf [ZTF20acohkja]21:15:18.839-17:36:05.54Blue and featureless. Extremely tentative detection of an emission feature at 6563 Ang is potentially consistent with a CV21:15:18.839-17:36:05.54Other