DRAFT
2026-05-08 11:30:46
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.129....1B
NOT Spectroscopic Classification of Transients
Source Group: ZTF
Abstract:
We report the spectroscopic classification of 7 transients obtained with the Nordic Optical Telescope as part of the Observational Astrophysics II course at Stockholm University.
As part of the Observational Astrophysics II course at Stockholm University (SU) we obtained spectroscopic observations of 7 transients, using the Nordic Optical Telescope (NOT) on La Palma for remote observing on May 7th 2026. Here we report the classification obtained through spectral matching using SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv.2603.28741). The observations were taken with the ALFOSC instrument mounted on the NOT using Grism#4 and a 1.0 (or 1.3) arcsec wide slit. The targets reported here were supplied by the Zwicky Transient Facility (ZTF, Bellm et al. 2019).
Below we list the classified objects. All the spectra can be accessed through the Transient Name Server and also the WISeREP repository.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2026kyp [ZTF26aatidrh] | 09:07:24.047 | +12:24:11.80 | SN Ia | 0.087 | SDSS J090724.21+122410.1 | Matches with a Type Ia SN2008bf around maximum using SNID-SAGE. Redshift and Phase are derived from SNID-SAGE. | 09:07:24.047 | +12:24:11.80 | SN Ia | 0.087 | |
| TNS | 2026iic [ZTF26aaqdhwx] | 09:31:50.563 | -00:02:37.62 | SN Ia-CSM | 0.111 | LEDA 1153285 | 0.111093 | Matches with a Type Ia-CSM SNe 2016iks and LSQ15adm using SNID-SAGE. The light curve is rising over 45 d and currently peaks at around -20.3 mag (I-band). Redshift is the catalogued spectroscopic redshift of the host LEDA 1153285. | 09:31:50.563 | -00:02:37.62 | SN Ia-CSM | 0.111 |
| TNS | 2026lap [ZTF26aaumtdl] | 16:11:49.625 | -12:20:03.25 | SN Ia | 0.042 | WISEA J161149.61-122004.0 | Matches with Type Ia SN2003du 7 days before maximum. Redshift and Phase are derived from SNID-SAGE | 16:11:49.622 | -12:20:03.31 | SN Ia | 0.042 | |
| TNS | 2026jms [ZTF26aasygmo] | 11:30:53.180 | -04:21:09.35 | SN IIb | 0.0369 | LEDA 1059440 | 0.0369 | Matches with Type IIb 2011dh at around maximum. Redshift is the catalogued spectroscopic redshift of the host LEDA 1059440. | 11:30:53.178 | -04:21:09.37 | SN IIb | 0.0369 |
| TNS | 2026jzl [ZTF26aatbuhc] | 16:40:16.563 | -10:59:34.45 | SN Ib | 0.067 | Matches peculiar Ib 2021ukt/2019odp using SNID-SAGE. Redshift derived from SNID-SAGE. | 16:40:16.563 | -10:59:34.45 | SN Ib | 0.067 | ||
| TNS | 2026iha [ZTF26aarorxm] | 17:06:08.619 | +30:34:00.57 | SN IIn | 0.084 | Spectrum shows Halpha/Hbeta emission lines along with He II+CIII/NIII flash features at a redshift of 0.084. The light curve peaks at around -18.7 mag (r-band) with a rise time of around 30d. SNID SAGE gives matches to a Type IIn SN 2017hcc spectrum at +48 days, consistent with discovery 46 days earlier. Due to its long-lived nature, we classify it as a Type IIn, but encourage further follow-up. | 17:06:08.619 | +30:34:00.57 | SN IIn | 0.084 | ||
| TNS | 2026akp [ZTF26aaqklxk] | 22:51:21.878 | +32:21:10.23 | SN II | 0.0214 | UGC 12218 | 0.021371 | Matches with a Type II SN 2 months after maximum using SNID-SAGE. Redshift is the catalogued spectroscopic redshift of the host UGC 12218. | 22:51:21.888 | +32:21:10.22 | SN II | 0.0214 |
Comments