AstroNote 2021-11

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DRAFT
2021-01-08 19:46:36
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: S. Srivastav, J. Gillanders, M. Fulton, K. W. Smith, L. J. Shingles (QUB), S. Prentice (TCD), C. Gutierrez (Turku), S. Benetti (INAF), 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+
Abstract:
This report includes classifications of 8 Type Ia's, 1 Type Ia-CSM, 1 Type Ic, 1, SLSN-I, 1 Type II and 1 galaxy. The spectrum obtained for 2020aeus is consistent with a galaxy, however, a transient object was clearly detected at the candidate coordinates by two independent surveys. 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 (Smith et al. 2020 2020arXiv200309052S) and 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 ALeRCE broker (Forster et al. 2020 https://arxiv.org/abs/2008.03303). 

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2021 January 07, 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 http://www.pessto.org (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
TNS2020aeur [PS20nui]09:26:20.381+01:52:43.92SN Ia-CSM0.051SDSS J092620.26+015242.30.50604Pan-STARRS+8 to +10Spectrum dominated by galaxy light, although able to get matches with Type Ia-CSM using SNID. Galaxy lines from host place this at a redshift z = 0.051 which is consistent with known host redshift z = 0.050604.09:26:20.385+01:52:43.94SN Ia-CSM0.051
TNS2020adeq [ZTF20acynllu]01:13:05.646-18:07:03.72SN Ia0.06WISEA J011305.44-180700.3ZTF+11 to +20Redshift acquired from SNID template match as there is no known host redshift.01:13:05.646-18:07:03.72SN Ia0.06
TNS2021ab [ZTF21aaabuoj]10:23:48.870-26:28:09.78SN Ia0.07WISEA J102348.94-262810.4ZTF-3 to +3Redshift acquired from SNID template match as there is no known host redshift.10:23:48.869-26:28:09.76SN Ia0.07
TNS2021ek [ZTF21aaarmti]03:23:49.900-10:02:41.24SLSN-I0.193WISEA J032349.97-100241.9ZTF-3 to +3Narrow H-alpha and H-beta from host imply a redshift of z = 0.193 (no known host redshift). Possible broad O II features around 4200 to 4500 A (rest wavelength). At this distance the ZTF lightcurve implies M_g = -21 suggesting this is a SLSN-I.03:23:49.914-10:02:41.18SLSN-I0.193
TNS2021lm [ZTF21aabhfta]00:31:18.171-25:39:31.58SN Ia0.117WISEA J003118.18-253931.10.1171ZTF-3 to +3Spectrum diluted by galaxy light. However, weak Si II is visible, so matches can be made with normal Type Ia on SNID. Redshift from host.00:31:18.171-25:39:31.58SN Ia0.117
TNS2021mf [ATLAS21ajm]13:01:51.234-41:24:14.61SN Ia0.029ESO 323- G 0660.02873ATLAS-3 to +3Redshift from host.13:01:51.234-41:24:14.61SN Ia0.029
TNS2021mj [ATLAS21ajx]09:16:18.157-32:29:25.89SN Ia0.04WISEA J091616.87-322934.6ATLAS-7 to -4Redshift acquired from SNID template match as there is no known host redshift.09:16:18.157-32:29:25.89SN Ia0.04
TNS2021nf [ATLAS21amw]05:28:29.242-38:16:41.66SN II0.03WISEA J052829.66-381647.6ATLAS+8 to +10Redshift acquired from SNID template match as there is no known host redshift.05:28:29.242-38:16:41.66SN II0.03
TNS2021nu [ATLAS21apa]01:52:15.949+14:36:28.60SN Ic0.044SDSS J015216.46+143620.00.044087ATLAS-7 to -4H-alpha from host implies a redshift z = 0.044 which is consistent with the known host redshift z = 0.044087.01:52:15.949+14:36:28.60SN Ic0.0441
TNS2021nv [ATLAS21aqr]01:57:35.175+19:52:42.97SN Ia0.029UGC 014360.029454ATLAS10 to -8Redshift from host.01:57:35.175+19:52:42.97SN Ia0.029
TNS2020adhg [ATLAS20birn]02:06:12.274-41:49:51.97SN Ia0.074WISEA J020612.29-414952.4ATLAS+11 to +20Narrow H-alpha and H-beta from host imply a redshift z = 0.074. Redshift acquired from SNID template match as there is no known host redshift.02:06:12.274-41:49:51.97SN Ia0.074
TNS2021pl [ZTF21aaahuox]12:11:37.962+12:09:47.08SN Ia0.074SDSS J121137.03+120959.00.07378ZTF-3 to +3Redshift from host.12:11:37.960+12:09:46.98SN Ia0.07378
TNS2020aeus [ZTF20acwondx]08:49:17.088-04:39:37.24Galaxy0.073WISEA J084917.05-043936.6ZTFSpectrum is consistent with a galaxy, however, a transient object was clearly detected at the candidate coordinates by two independent surveys: Pan-STARRS and ZTF. The strong H-alpha implies a redshift of z = 0.073.08:49:17.088-04:39:37.24Galaxy0.073