AstroNote 2020-43

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2020-02-19 17:22:08
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: M. Smith (Southampton), A. Möller, M. Amenouche (Clermont-Ferrand), T. Muller Bravo, M. Pursiainen (Southampton), C. Angus (DARK), L. Galbany (Granada), R. Cartier (CTIO), H. Kuncarayakti (Turku), S. Benetti (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), I. Manulis (Weizmann)
Source Group: ePESSTO+
This report includes classifications of 3 Type Ia's (2 normal and 1 91T-like event). AT2020cry presents a featureless continuum with no firm transient or host galaxy features. Weak Balmer emission at z=0 may be present (which suggests a galactic CV origin for the transient), however the detection is not firm enough for a secure classification.

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 Zwicky Transient Facility ZTF (Kulkarni 2018 2018ATel11266....1K) - data stream processed through the Lasair broker (Smith, Williams, Young et al. 2019 2019RNAAS...3a..26S), by the ESA Gaia Photometric Science Alerts Team DPAC, and the Backyard Observatory Supernova Search BOSS (targets supplied by Stuart Parker).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2020 Feb 18, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) 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
TNS2020bza [ZTF20aamfpcj]09:46:26.006+21:13:45.01SN Ia-91T-like0.08850.0885ZTFAround maxRedshift measured from host galaxy emission lines09:46:26.006+21:13:45.01SN Ia-91T-like0.0885
TNS2020cdr04:50:24.230-61:20:49.30SN Ia0.019ESO 119-130.019BOSSAround maxRedshift from apparent host galaxy, in agreement with SN template fits04:50:24.270-61:20:49.49SN Ia0.019
TNS2020cqp [Gaia20ava]14:32:21.070-03:40:13.12SN Ia0.077LCRS B142945.0-0326580.077Gaia, ZTFpre-maxRedshift from apparent host galaxy, in agreement with SN template fits14:32:21.070-03:40:13.12SN Ia0.077
TNS2020cry [ZTF20aaodnaa]14:54:58.250-01:32:30.30Gaia, ZTFSpectrum presents a continuum, with no firm features. Tentative Balmer emission at z=0 may be present, although this detection is not firm. The transient is hostless, and the light curve suggests a young event.14:54:58.250-01:32:30.30