AstroNote 2019-116

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2019-10-28 17:18:27
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: P. Charalampopoulos, G. Leloudas, (DTU Space), L. Izzo, C. R. Angus (DARK/NBI), D. B. Malesani (DTU Space), I. Mandel (Birmingham), M. Fraser (Univ. College Dublin), L. Galbany (UGR), 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 2 Type Ia's (one 91T-like), 2 Type IIn’s, 1 Dwarf Nova and 2 unclassified nuclear transients. ZTF19achewzu and AT2019ths are nuclear transients whose spectra are consistent with galaxies at z=0.1 and z=0.071 respectively. We do not see any clear transient signatures within the spectra. 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), 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), and the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014 2014ApJ...788...48S).


Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2019 October 27, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), Superfit (Howell et al. 2005 2005ApJ...634.1190H) and astroDASH (Muthukrishna et al. 2019 2019arXiv190302557M).

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
OtherZTF19achewzu00:07:14.540+04:13:14.43Galaxy0.1ZTFUnclassified nuclear transient. Spectrum consistent with a galaxy at z~0.1
TNS2019tkn [ZTF19achetvw]00:25:42.040+08:38:08.56SN Ia0.043ZTFpre-max00:25:42.053+08:38:08.36SN Ia0.043
TNS2019ths [ATLAS19ytu]00:28:01.334-04:33:16.80SN IIn0.1660.166ATLAS, PS1Around max?Phase unclear from early limits00:28:01.331-04:33:16.78SN IIn0.166
TNS2019tkd [ZTF19aciiuta]00:22:45.154-20:04:08.72Galaxy0.071WISEA J002245.12-200406.5ZTFUnclassified nuclear transient. Spectrum consistent with galaxy at z=0.07100:22:45.154-20:04:08.72Galaxy0.071
TNS2019pdi [ATLAS19unl]02:18:26.237-00:33:05.46SN IIn0.1PS1, ATLAS, ZTFNear maxSlow rising transient. H-alpha profile consistent with SN at z=0.102:18:26.237-00:33:05.46SN IIn0.1
TNS2019tjm [ASASSN-19zw]01:16:45.307-28:33:39.92SN Ia-91T-like0.037AM 0114-284 NED030.036655ASASSN-2Redshift from host galaxy absorption features01:16:45.210-28:33:39.85SN Ia-91T-like0.037
TNS2019tkh [ASASSN-19zx]05:46:20.782-73:22:15.02CVLMC05:46:20.920-73:22:15.00CV