DRAFT
2025-09-02 08:42:49
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.278....1C
adH0cc spectroscopic classification of SN2025vgm
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SN 2025vgm, which shows it to be a young Type II supernova. The supernova exploded in the same galaxy as the Type Ia supernova SN 2017glz.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2025vgm. The target was supplied by the ATLAS survey (Tonry et al. 2018, 2018PASP..130f4505T). The observations were performed on the night of 2025 Sep. 01 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 | 2025vgm [ATLAS25kqy] | 00:12:51.243 | -22:51:47.68 | SN II | 0.0535 | 0.0535 | ATLAS | 5 - 10 days | The SN shows broad and weak P Cygni lines of H and He, indicative of a young Type II supernova. The redshift was estimated based on the narrow Halpha emission line seen in the extracted background spectrum.. | 00:12:51.252 | -22:51:47.46 | SN II | 0.0535 |
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