AstroNote 2019-157

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DRAFT
2019-12-19 17:15:21
Type: Object/s-Discovery/Classification
adH0cc spectroscopic classification of SN 2019wxt
Authors: C. Vogl, A. Floers, S. Taubenberger, W. Hillebrandt, S. Suyu (MPA Garching), R. Kotak (Turku), S. J. Smartt, M. Dobson (QUB), B. Leibundgut, J. Spyromilio (ESO), R. Bruch, A. Gal-Yam (Weizmann)
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SN 2019wxt, which shows a blue continuum with weak, broad helium lines superimposed. The spectrum suggests SN 2019wxt to be a young SN Ib or IIb.

The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2019wxt. The target was supplied by the Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), through McLaughlin et al. AstroNote 2019-154 and McBrien et al., GCN 26485. We selected this target as a possible young SN II, at the right magnitude in our target redshift range for SNe II-P in the Hubble flow. The observations were performed  on the night of 2019 December 18 with the ESO Very Large Telescope UT1, equipped with the FORS2 spectrograph and grism 300V, covering a wavelength range from 3400 to 9600A at a resolution of 10A.

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CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019wxt [PS19hgw]01:55:41.941+31:25:04.49SN Ib0.036KUG 0152+3110.036The FORS2 spectrum of SN 2019wxt is dominated by a blue continuum (see also Dutta et al., GCN 26490; Izzo et al., GCN 26491; Srivastav & Smartt, GCN 26493; Müller Bravo et al., GCN 26294 and AstroNote 2019-156), with a few broad undulations and with narrow H II-region lines superimposed. From the narrow emission lines, we derive a redshift of z = 0.036, in agreement with the spectroscopic redshift of the host galaxy. Some of the weak, broad features can be attributed to helium lines, with the 5876A and 7065A lines of He I providing the cleanest identifications. Broad hydrogen lines are not unambiguously detected. Based on these properties, we classify SN 2019wxt as a young SN Ib, but note similarities to some SNe IIb such as SN 2011fu (Morales-Garoffolo et al. 2015, MNRAS, 454, 95) at comparably early phases.01:55:41.941+31:25:04.55SN IIb0.036