AstroNote 2021-5

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2021-01-04 17:37:31
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Gillanders, K. W. Smith, S. Srivastav (QUB), L. Galbany (Granada), G. Pignata (UNAB), S. Yang, J. Anderson (ESO), T. Muller Bravo (Southampton), T. -W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), S. Benetti (INAF), J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), S. J. Smartt, O. McBrien (QUB), O. Yaron, I. Manulis (Weizmann), D. Young (QUB)
Source Group: ePESSTO+
This report includes classifications of 3 Type Ia's and a Ia-91T. SN2021J is a nearby Ia at ~18 Mpc, around two weeks before maximum. 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 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 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 2021 January 03, 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
TNS2021J [ZTF21aaabvit]12:26:27.031+31:13:20.59SN IaNGC 44140.002388-13young SN Ia with Si II velocity of ~16,000 km/sec.12:26:27.011+31:13:20.55SN Ia0.002388
TNS2020adph [ATLAS20bjih]12:48:34.351-32:04:43.14SN Ia-91T-like0.06-5 to -7Redshift from SNID.12:48:34.351-32:04:43.14SN Ia-91T-like0.06
TNS2020aesr [ATLAS20bjyr]05:35:17.504-28:52:39.24SN Ia0.06+17 to +20Redshift from SNID.05:35:17.504-28:52:39.24SN Ia0.06
TNS2020adag [ASASSN-20qa]01:45:27.228+02:08:04.13GalaxyWISEA J014527.26+020803.3Low S/N, consistent with galaxy spectrum.01:45:27.228+02:08:04.13Galaxy