AstroNote 2020-235

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2020-11-22 17:24:02
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: Nada Ihanec, Mariusz Gromadzki (Warsaw), Seán Brennan, Morgan Fraser, Roberta Carini (INAF), Phil Wiseman (Southampton) Giuliano Pignata (UNAB),J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron, I. Manulis, E. Zimmerman (Weizmann), D. Young (QUB)
Source Group: ePESSTO+
This report includes the classification of 1 Type Ia and 1 Type IIn. SN 2020yrn is a Type IIn at z=0.123. First discovery by Gaia means it is at least one month from explosion. We see a blue continuum, narrow Balmer emission and also He lines at 5876, 7065.

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 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 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 21, 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
TNS2020yrn22:12:56.060+12:48:30.92SN IIn0.123> several weeksRedshift measured from narrow emission lines22:12:56.060+12:48:30.92SN IIn0.123
TNS2020zka08:18:31.259-04:21:41.96SN Ia0.095WISEA J081831.49-042139.0At maxRedshift measured from SNID08:18:31.264-04:21:41.94SN Ia0.095