AstroNote 2020-64

Primary tabs

2020-03-17 18:39:30
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: S. Gonzalez-Gaitan (CENTRA), J. Pineda (UNAB), C. Gutierrez (Southampton), A. Morales-Garoffolo (U Cadiz), L. Galbany (U Granada) , M. T. Botticella (INAF), P. Wiseman (Southampton), S. Srivastav (QUB), 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), 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 (QUB)
Source Group: ePESSTO+
This report includes the classifications of 3 Type Ia SNe. SN 2020ecn is a 91bg-like past maximum light, while SNe 2020eei and 2020enj are at phases around peak.

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), the ATLAS survey (Tonry et al. 2018 2018PASP..130f4505T), the Zwicky Transient Facility ZTF (Kulkarni 2018 2018ATel11266....1K) - 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 nights of 2020 Mar 15 and 16, 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
TNS2020ecn [ZTF20aasnzni]11:59:27.331-20:26:41.25SN Ia-91bg-like0.021ESO 572- G 0350.021401ZTF+11 to +20Redshift consistent with the host and SNID matches11:59:27.331-20:26:41.25SN Ia-91bg-like0.021
TNS2020eei [ZTF20aasxfcd]15:47:05.903+08:51:44.77SN Ia0.07ZTF-3 to +3Redshift consistent with the host and SNID matches15:47:05.887+08:51:44.75SN Ia0.07
TNS2020enj [ATLAS20hza]10:20:57.061+00:34:25.24SN Ia0.104ATLAS-3 to +3Redshift derived from SNID matches10:20:57.071+00:34:25.55SN Ia0.104