Spectroscopic Classification of Optical Transients with the Lick Shane telescope

ATel #17235; K. Taggart, R. J. Foley (UCSC)
on 18 Jun 2025; 22:43 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Kirsty Taggart (k.taggart@ucsc.edu)

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Title: Spectroscopic Classification of Optical Transients with the Lick Shane telescope Authors: K. Taggart, R. J. Foley (UCSC)

We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by the Young Supernova Experiment and ZTF. All observations were made on 2025 June 18 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name | RA (J2000)  | Dec (J2000) |   z   | Type  | Phase | Notes 
PS25cxw      |  2025mbd | 17:07:28.15 | +34:34:04.11| 0.027 |  IIn  | peak  | (1) 
ZTF25aaufdhw |  2025nbz | 22:11:52.21 | +00:06:38.49| 0.033 |  II   | peak  | (2) 

Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy.

1) The recent spectrum exhibits broad H-alpha emission (FWHM 4,900 km/s) consistent with a Type IIn supernova, and we therefore update the classification from SN to Type IIn. 2) We measure narrow H-alpha emission with absorption minimum -1,500 km/s atop of a broader H-alpha emission component with absorption minimum -9,900 km/s.