AstroNote 2019-80

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DRAFT
2019-08-28 20:56:56
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of AT 2019lwu as a TDE
Authors: M. Gromadzki, N. Ihanec (Warsaw), E. Callis, S. Brennan (Univ. Collage Dublin), M. T. Botticella (INAF-Capodimonte), H. Kuncarayakti (Turku) , J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (MPE), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Edinburgh), O. Yaron, l. Manulis (Weizmann), D. Young (QUB), I. Arcavi (Tel Aviv)
Source Group: ePESSTO+
Abstract:
This report classifications of AT 2019lwu as a TDE at a redshift 0.117.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the classification of AT 2019lwu as a TDE.

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2019 August 27, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution).

The spectrum obtained shows a blue continuum with superimposed broad Ha, Hb and HeII+NIII emission lines and Ca II H&K absorption lines at a redshift 0.117. The discovery of transient was reported by ZTF (Fremling, 2019TNSTR1352....1F), previous classifcations are inconlusive and report a blue continuum and featureless spectrum ( Frohmaier et al, AstroNote #2019-58; Nicholl et al., AstroNote #2019-59).

The classification spectrum and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified object is 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
TNS2019lwu [ZTF19abidbya]23:11:12.305-01:00:10.71TDE0.117ZTF30Spectrum of object shows blue continuum with superimposed broad Ha, Hb and HeII+NIII emission lines and Ca II H & K absorption lines. line23:11:12.305-01:00:10.71