AstroNote 2020-2

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DRAFT
2020-01-02 19:34:36
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: N. Meza (PUC), T. Müller Bravo, P. Wiseman, M. Grayling (Southampton), L. Galbany (UGR), T. Nagao (ESO), M. T. Botticella (INAF), S. Benetti (OAPd-INAF), J. Anderson (ESO), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), 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), I. Manulis (Weizmann)
Source Group: ePESSTO+
Abstract:
This report includes classifications of 1 Type Ia SN around maximum brightness, and an interacting SN. SN2019yzw displays signs of interaction, and spectral follow up is encouraged. We also report the non-detection of AT2019zel at a limiting magnitude of V~20 mag, 4 days after it was detected by ATLAS at c=19 mag.

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, see Tonry et al. (2018, PASP, 130,  064505), 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 2010 Jan 01, 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, A&A, 488, 383).

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

The classified objects are listed in the Related Objects table below.

The spectrum of SN2019yzw displays similarities to SN2004aw (Ic), SN2002ic (Ic/Ia-CSM), and PTF11kx (Ia-CSM), although we cannot rule out the narrow emission being solely from the host.

We took acquisition images (30s and 60s in V) of AT2019zel and did not detect the transient. The images were taken in twilight and have detection limits of around V ~ 20. This indicates the object has faded from c = 19.2 +/- 0.2, when it was discovered (MJD  58846.6)  to fainter than 20 on 58850.4. Further data will be taken to confirm if the transient is visible.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftSourcePhase (days)RemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019yzx [ZTF19adcbxkw]09:30:41.318+21:27:21.26SN Ia0.057SDSS J093041.44+212722.00.057maxRedshift from host galaxy09:30:41.315+21:27:21.19SN Ia0.057
TNS2019yzw [ZTF19adccckb]10:24:48.775+19:20:20.05SN0.17WISEA J102448.62+192020.40.170559Redshift from narrow host galaxy features10:24:48.775+19:20:20.05SN0.17
TNS2019zel [ATLAS19bfkt]13:25:52.255-00:40:44.09OtherSDSS J132551.78-004044.40.0549Transient not detected in Vlim~20 acquisition image13:25:52.255-00:40:44.09