DRAFT
2025-09-22 11:34:39
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.289....1C
adH0cc spectroscopic classification of SN 2025xxi
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SNe 2025xxi, which shows it to be a Type II supernova. SN 2025xxi is the sibling of the Type II SN 2019dez.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2025xxi. The target was supplied by the ATLAS survey (Tonry et al. 2018, 2018PASP..130f4505T). The observations were performed on the night of 2025 Sept. 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 | 2025xxi [ATLAS25lon] | 21:16:01.364 | -58:38:03.67 | SN II | 0.0345 | APMBGC 144-129-063 | ATLAS | 7 d | The spectrum shows P Cygni features of H and He, indicative of a young Type II supernova. Redshift was measured based on narrow host galaxy emission lines seen in the spectrum. | 21:16:01.364 | -58:38:03.67 | SN II | 0.0345 |
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