AstroNote 2021-8

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2021-01-06 16:52:31
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Gillanders, S. Srivastav, M. Fulton, L. J. Shingles, K. W. Smith (QUB), S. Prentice (TCD), C. Gutierrez (Turku), S. Benetti (INAF), K. Maguire (TCD), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), E. Zimmerman, O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry,  L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii),  B. Stalder (LSST), A. Rest (STScI), S. J. Smartt, O. McBrien (QUB)
Source Group: ePESSTO+
This report includes classifications of 6 Type Ia's, 1 Type Ia-91T, 1 CV and 1 featureless blue continuum. 2021ft is possibly a young transient whose spectrum resembles a blue featureless continuum. 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 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 2021 January 05, 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) and Superfit (Howell et al. 2005 2005ApJ...634.1190H).

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
TNS2020adqq [ZTF20acztnts]11:05:58.731+07:20:01.64SN Ia0.0682MASX J11055879+07195590.068197ZTF–3 to +311:05:58.728+07:20:01.78SN Ia0.068197
TNS2020adnq [ATLAS20bjgs]14:13:24.188+06:23:05.87SN Ia0.036SDSS J141324.40+062304.60.035913ATLAS+11 to +20Consistent with the classification reported in the TNS Classification Report No. 8399.14:13:24.188+06:23:05.87SN Ia0.036
TNS2021aq [ZTF21aaaecrv]03:11:05.699-25:59:57.77SN Ia0.078WISEA J031105.46-255956.50.0755ZTF–3 to +3 days03:11:05.699-25:59:57.77SN Ia0.078
TNS2020aeru [Gaia21aai]03:56:20.790-63:32:17.66SN Ia0.058WISEA J035626.10-633221.20.059341Gaia+11 to +2003:56:20.790-63:32:17.66SN Ia0.058
TNS2021fu [ATLAS21aan]01:30:03.284+11:48:48.84SN Ia0.06SDSS J013003.41+114846.6ATLAS–3 to +3Redshift acquired from SNID.01:30:03.284+11:48:48.84SN Ia0.06
TNS2021ft [ATLAS21aam]02:27:43.829+26:14:03.56CGCG 483-0580.031699ATLASSpectrum resembles a blue featureless continuum. The ATLAS lightcurve displays a slowly rising blue transient, which may suggest this is a young Type II.02:27:43.810+26:14:03.59
TNS2021fv [ATLAS21aao]08:43:48.913+02:43:12.11SN Ia0.03CGCG 033-0010.025995ATLAS–7 to –4Redshift acquired from SNID.08:43:48.908+02:43:12.18SN Ia0.03
TNS2021fw [ATLAS21aap]04:20:26.808-33:11:56.99CV0ATLASOrphan transient whose spectrum resembles a blue continuum with prominent H-alpha and H-beta at rest wavelength.04:20:26.808-33:11:56.99CV
TNS2021X [ZTF21aaafrnh]05:23:18.221-27:50:14.96SN Ia-91T-like0.062WISEA J052318.28-275014.8ZTF–7 to –4Redshift acquired from narrow galaxy lines.05:23:18.221-27:50:15.18SN Ia-91T-like0.062