DRAFT
2025-03-25 10:55:39
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..97....1C
adH0cc spectroscopic classification of SN 2025dyr
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SN 2025dyr, which shows it to be a young Type II supernova. The supernova occurred in the same host galaxy as the Type Ia supernova SN 2023lhq.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2025dyr. 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 2025 March 21 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 | 2025dyr [ATLAS25coc] | 16:48:10.273 | +18:01:11.88 | SN II | 0.03426 | MCG+03-43-003 | 0.03426 | ATLAS | 14d | The SN shows broad P Cygni lines of H and He, indicating it is a Type II supernova. GELATO (Harutyunyan et al. 2008, 2008A&A...488..383H) found good matches with canonical SN II spectra two weeks after explosion. We adopted the redshift of the host for the supernova. | 16:48:10.273 | +18:01:11.88 | SN II | 0.03426 |
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