AstroNote 2020-211

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2020-10-27 16:20:49
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Gromadzki, N. Ihanec, (Warsaw), T. Wevers (ESO), N. Elias-Rosa (INAF-OAPd/CSIC-ICE), P. Wise (Southampton), T.-W. Chen, T. Schweyer (Stockholm), S. Benetti (INAF-OAPd), J. Anderson (ESO), T. Muller Bravo (Southampton), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), 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)
Source Group: ePESSTO+
This report includes classifications of 5 Type Ia's, one galaxy and one nuclear transient. AT2020xys has a boxy He II 4686 feature as well as Bowen features, and resembles the AT2017bgt-like class of nuclear transients. Follow-up observations are encouraged.

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 ATLAS survey (Smith et al. 2020 2020arXiv200309052S), 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 October 26, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H).

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
TNS2020xys [ZTF19aaaciwt]06:29:56.855-26:58:31.92Other0.072Redshift from host emission lines. Broad H Balmer lines, a boxy He II 4686 feature as well as Bowen features, resembling the AT2017bgt-like class of nuclear transients06:29:56.855-26:58:31.92Other0.072
TNS2020xqr [ZTF20aclzegl]04:30:51.049+09:04:06.64SN Ia0.06around peak lightredshift from SNID04:30:51.043+09:04:06.65SN Ia0.06
TNS2020xzm [ZTF20aclovun]07:21:14.017-11:55:25.42SN Ia0.08WISEA J072114.54-115530.5around peak lightredshift from SNID07:21:14.017-11:55:25.42SN Ia0.08
TNS2020ybt [ZTF20acndqhk]04:14:51.975+23:42:00.72SN Ia0.09WISEA J041451.94+234159.7-7 to -5redshift from SNID. significant reddening (E(B-V)~0.5)04:14:51.981+23:42:00.94SN Ia0.09
TNS2020yep [ATLAS20berl]01:54:33.049-02:55:06.22SN Ia0.13around peak lightredshift from SNID01:54:33.040-02:55:06.57SN Ia0.13
TNS2020yex [Gaia20eyb]02:26:38.490-52:43:36.80SN Ia-91T-like0.09around peak lightredshift from SNID. Possible faint, narrow Halpha02:26:38.490-52:43:36.80SN Ia-91T-like0.09
TNS2020yaj [GSNST-20cr]04:00:14.710-41:20:45.67Galaxy0.0572MASX J04001487-41204490.057683redshift derived from host Na I D absorption line04:00:14.710-41:20:45.67Galaxy0.057