AstroNote 2020-220

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2020-11-06 17:16:13
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: N. Ihanec, M. Gromadzki (Warsaw), S. Moran (UTU), E. Callis, M. Fraser (UCD), C. Barbarino (Stockholm), P. Pessi (ESO), E. Parrag (Cardiff), 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 (Weizmann), D. Young (QUB), I. Manulis (Weizmann), S. J. Smartt, K. W. Smith, S. Srivastav (QUB), K. C. Chambers, T. de Boer, J. Bulger, J. Fairlamb, M. Huber, C.-C. Lin, T. Lowe, E. Magnier, A. Schultz, R. J. Wainscoat, M. Willman (IfA, Univ. Hawaii)
Source Group: ePESSTO+
This report includes classifications of 3 Type Ia's, and 1 SLSNe Ic. SN2020xga SLSN Ic at z=0.36, relatively soon after explosion. 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 Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), 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 Nov 05, 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
TNS2020yyk [ZTF20acopmey]22:22:46.754-01:37:28.24SN Ia-91T-like0.08SDSS J222246.77-013728.10.204-7 to -4Redshift from SNID match.22:22:46.754-01:37:28.24SN Ia-91T-like0.08
TNS2020yte [ZTF20acmzfsz]23:15:38.848+00:22:25.90SN Ia0.125WISEA J231538.78+002224.70.125207at maxRedshift from SNID match. Spectrum is heavily contaminated by host galaxy light.23:15:38.848+00:22:25.90SN Ia0.125
TNS2020xga [PS20jxm]03:46:39.365-11:14:33.90SLSN-I0.44Around peakRelatively soon after explosion. The two absorptions at 6000, 6400 Ang are the characteristic W-feature seen from OII. The strong absorption in the blue is MgII. The abs mag is ~-21.6.03:46:39.365-11:14:33.90SLSN-I0.44
TNS2020ywy [PS20kum]01:00:33.454-01:41:06.00SN Ia0.04at maxRedshift from SNID match.01:00:33.452-01:41:06.00SN Ia0.04