DRAFT
2021-08-31 17:31:01
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN.230....1C
adH0cc spectroscopic classification of SN 2021wxl, SN 2021wzr, and SN 2021xbg
Source Group: adH0cc
Abstract:
We have obtained optical spectra of SN 2021wxl, SN 2021wzr, and SN 2021xbg, which show them to be two Type II supernovae and one Type Ib/c supernova, respectively.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transients SN 2021wxl, SN 2021wzr and SN 2021xbg. The targets were supplied by the Zwicky Transient Facility ZTF (Kulkarni 2018, 2018ATel11266....1K), the ATLAS survey (Tonry et al. 2018, 2018PASP..130f4505T) and the Pan-STARRS survey for Transients (Huber et al. 2015, 2015ATel.7153....1). The observations were performed on the night of 2021 August 30 with the ESO Very Large Telescope UT1, equipped with the FORS2 spectrograph and grism 300V, covering a wavelength range from 3400 to 9600 Å at a resolution of 10 Å.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Source | Phase | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2021wxl [PS21jnc] | 04:56:18.340 | -12:21:16.24 | SN II | 0.0473 | WISEA J045618.38-122112.2 | 0.047296 | Pan-STARRS, ATLAS | 10 d | The spectrum shows a blue continuum with P-Cygni features of H and He, indicative of a young Type II supernova. The ATLAS forced-photometry light curve of the object suggests it to be about 10 days old, which is also supported by the convincing match with SN 1999em at 8 to 10 days found by GELATO (Harutyunyan et al. 2008, 2008A&A...488..383H). We have adopted the redshift of the host for the SN redshift. | 04:56:18.340 | -12:21:16.30 | SN II | 0.0473 |
| TNS | 2021wzr [ZTF21abvtynt] | 22:57:38.483 | +14:30:06.34 | SN II | 0.0633 | WISEA J225739.06+143005.0 | 0.063341 | ZTF, ATLAS | 7 d | The spectrum shows a blue continuum with P-Cygni features of H and He, indicative of a young Type II supernova. The ZTF and ATLAS light curves of the object suggest it to be about 6 to 10 days old, which is also supported by the convincing match with SN 1999gi and SN 1999em at 7 days found by GELATO (Harutyunyan et al. 2008, 2008A&A...488..383H). We have adopted the redshift of the host for the SN redshift. | 22:57:38.481 | +14:30:06.28 | SN II | 0.0633 |
| TNS | 2021xbg [ZTF21abvcuhk] | 02:23:56.453 | -06:42:03.75 | SN Ib/c | 0.0319 | FGC 0286 | 0.031889 | ZTF, ATLAS | before or at max. | The spectrum shows a blue continuum with spectral features that suggest it to be a young stripped-envelope core-collapse supernova. SNID (Blondin & Tonry 2011, 2011ascl.soft07001B) finds good matches with the Type Ic supernovae SN 1983V, SN 2004aw and SN 2007gr before or near peak brightness. He I lines are not unambiguously detected, favouring a SN Ic designation. However, the presence of a putative Halpha P-Cygni line with an expansion velocity of 5500-6000 km/s makes the object somewhat peculiar. We have adopted the redshift of the host for the SN redshift. | 02:23:56.448 | -06:42:03.68 | SN Ib/c | 0.0319 |
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