DRAFT
2021-04-17 17:12:52
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN.125....1T
adH0cc spectroscopic classification of SN 2021jpk
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SN 2021jpk, which shows it to be a Type Ibn supernova a few days before or at maximum.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2021jpk. The target was supplied by the Zwicky Transient Facility ZTF (Kulkarni 2018, 2018ATel11266....1K) and the ATLAS survey (Tonry et al. 2018, 2018PASP..130f4505T). The observations were performed on the night of 2021 April 16 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 (days) | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
TNS | 2021jpk [ZTF21aauvmck] | 14:39:00.025 | +12:40:10.02 | SN Ibn | 0.038 | WISEA J143900.45+124018.5 | 0.037978 | ZTF, ATLAS | -3 to 0 | The spectrum is characterized by a blue continuum with subtle narrow He P-Cygni features superimposed, indicative of a Type Ibn supernova. The spectrum is similar to that of SN 2010al two days after maximum, although SN 2021jpk has less prominent features and a bluer continuum (see attached figure). Combined with the still-rising ZTF light curve this suggests that the supernova is a few days before or at maximum. We adopted the redshift of the host as the supernova redshift. | 14:39:00.027 | +12:40:10.03 | SN Ibn | 0.038 |
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