AstroNote 2019-127

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2019-11-07 16:53:53
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: D. B. Malesani, P. Charalampopoulos (DTU Space), C. R. Angus, L. Izzo (DARK/NBI), G. Leloudas (DTU Space), P. Pessi (IALP), R. Cartier (CTIO), S. Prentice (TCD), M. Dennefeld (IAP), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (MPE), 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, 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 1 Type Ia, 1 Type II and 1 possible SLSN. ZTF19acokufi is a young SN-Ia with shallow silicon absorption, consistent with the 91T-like subclass. SN2019uez is a faint Type II (M = -15). AT2018lqi remains blue and featureless. This time we identify a tentative redshift of z=0.203 based on weak host galaxy lines. At this distance, the transient would be M=-20.9 mag, making it a candidate SLSN, consistent with its persisting light curve. We encourage further observations of this event

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), and 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 night of 2019 November 6, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) 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
TNS2019uez [PS19gjm]03:24:41.407-00:40:53.04SN II0.0391237660239777300705/12745/03240.039PS1pre-max03:24:41.409-00:40:53.06SN II0.039
OtherZTF19acokufi08:35:13.780+11:34:39.60SN Ia-91T-like0.076ZTF-4
TNS2018lqi [ATLAS19wtf]02:18:21.952-25:54:24.470.203ATLAS, PS1, ZTFBlue and featureless spectrum. Tentative redshift based on Ha, [OII] and Hb02:18:21.952-25:54:24.47