DRAFT
2021-07-17 18:09:29
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN.196....1V
adH0cc spectroscopic classification of SN 2021tgd
Source Group: adH0cc
Abstract:
We have obtained an optical spectrum of SN 2021tgd, which shows it to be a Type Ia supernova close to maximum light.
The adH0cc programme for an "accurate determination of H0 with core-collapse supernovae" reports the classification of the optical transient SN 2021tgd. The target was supplied by the Pan-STARRS survey for Transients (Huber et al. 2015, 2015ATel.7153....1) and the Zwicky Transient Facility ZTF (Kulkarni 2018, 2018ATel11266....1K). The observations were performed on the night of 2021 July 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 | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2021tgd [PS21hyr] | 22:55:06.883 | +01:31:11.01 | SN Ia | 0.142 | SDSS J225507.06+013112.9 | 0.142 | PS1, ZTF | at max | Our spectrum shows SN 2021tgd to be a Type Ia supernova around B-band maximum light. SNID (Blondin & Tonry 2007; 2007ApJ...666.1024B) finds a good match with SN 1999ac at -2 days. A redshift of z = 0.142 has been determined from narrow host-galaxy emission lines. With this redshift, we measure a Si II line velocity of approximately 9500 km/s. | 22:55:06.883 | +01:31:11.01 | SN Ia | 0.142 |
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