AstroNote 2019-114

Primary tabs

2019-10-27 17:07:19
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: G. Leloudas, P. Charalampopoulos (DTU Space), C. R. Angus, L. Izzo (DARK/NBI), L. Galbany (UGR), I. Mandel (Birmingham), M. Fraser (Univ. College Dublin), 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 the classification of 3 Type Ia SNe, and 1 unclassified transient. We confirm the classification of SN2010rsx as a SN Ia, but we cannot confirm the 91T-like classification reported in TNS Classification Report No. 5327 due to the late phase of the SN. The spectrum of AT2019tdc shows a blue featureless continuum with narrow host galaxy emission lines at z=0.074. The H-beta profile is marginally broader than the other galaxy emission lines, which may suggest transient origin. We encourage follow-up 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), 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 October 26, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) 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
TNS2019svu [ATLAS19yln]02:39:23.465+12:40:49.72SN Ia0.047ATLAS, PS1+1502:39:23.465+12:40:49.72SN Ia0.047
TNS2019tdc [ATLAS19yru]22:09:34.378-40:36:35.680.074ATLASTransient spectrum is blue and featureless. Host galaxy emission lines provide a redshift of 0.074. The width of the H-beta line is broader than other galaxy emission lines, suggesting transient origin.22:09:34.378-40:36:35.680.074
TNS2019szv [ATLAS19ynh]06:43:30.878-35:45:53.24SN Ia0.033ATLAS-606:43:30.860-35:45:53.28SN Ia0.033
TNS2019rsx [ZTF19acchjle]03:47:10.869-10:59:40.69SN Ia0.07ATLAS, ZTF+10dIn agreement with redshift reported in TNS Classification Report 532703:47:10.869-10:59:40.69SN Ia0.072