AstroNote 2020-134

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DRAFT
2020-07-08 21:47:54
Type: Object/s-Discovery/Classification
NOT spectroscopic classification of three ZTF transients
Authors: Tassilo Schweyer (OKC, Stockholm University), Ting-Wan Chen (OKC, Stockholm University), Steve Schulze (Weizmann), Jesper Sollerman (OKC, Stockholm University)
Keywords: Supernova
Abstract:
We report the spectroscopic classification of three ZTF transients as supernovae. SN 2020gam is an old type II SN, SN 2020nqw is a type Ia around the peak and SN 2020lid is a Ib SN.
We report spectral classifications of three supernovae from the Zwicky Transient Facility (Bellm et al. 2018, PASP 131, 995).
 
Observations were carried out in the night of 2020-07-07 using the ALFOSC spectrograph mounted on the NOT 2.56m telescope at Roque de los Muchachos Observatory, La Palma.
For all observations we used Grism 4 and the 1.0 arcsecond slit.
Conditions were full moon, dusty atmosphere (calima), but cloudless.
 
All spectra were reduced using the pypeit pipeline using SP2209+178 as standard star.
Afterwards the spectra were crossmatched using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B).
 
SN 2020gam (ZTF20aauoktk) best matches a type II supernova. It is several moths past explosion based on the ZTF light curve. 
 
SN 2020nqw (ZTF20abixkhh) is a type Ia supernova close to maximum light.
 
SN 2020lid (ZTF20abjtavx, first reported as ATLAS20off) is a type Ib SN. The spectrum best matches with SN 1993J at several weeks past maximum. 
 
We thank Teet Kuutma and the NOT staff for obtaining these service observations.
 
Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020gam [ZTF20aauoktk]13:16:03.500+32:15:14.76SN II0.063SDSS J131603.48+321519.80.066017513:16:03.500+32:15:14.76SN II0.063
TNS2020nqw [ZTF20abixkhh]15:11:47.256+36:46:15.43SN Ia0.041WISEA J151147.12+364613.70.04455315:11:47.260+36:46:15.42SN Ia0.041
TNS2020lid [ZTF20abjtavx]00:20:00.774-06:20:04.31SN Ib0.014MCG -01-02-0010.01237200:20:00.787-06:20:04.16SN Ib0.14