Spectroscopic Classification of Astrophysical Transients with the Lick Shane Telescope
ATel #17318; K. W. Davis, R. J. Foley (UCSC)
on 3 Aug 2025; 15:04 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@ucsc.edu)
Subjects: Optical, Supernovae
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 August 3 UT. The targets were supplied by ATLAS, YSE, and ALeRCE (selected from the ZTF data stream). Targets were identified using the target management platform YSE-PZ (Coulter et al., 2023, PASP, 135, 4501). The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
PS25eqd | AT2025qmk | 16:25:01.607 | +40:56:45.72 | 0.0287 | SN II | +15d | (1)
ATLAS25hwg | AT2025rlk | 00:11:41.362 | -22:59:09.70 | 0.0644 | SN Ia | +12d | (2)
ZTF25abecbib | AT2025shi | 22:48:42.279 | +27:34:57.99 | 0.0320 | SN IIn-pec | rising | (3)
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) We measure a H-alpha absorption velocity of -8500 km/s.
(2) We measure a Si II 6355 absorption velocity of -10,800 km/s.
(3) We find several strong, narrow (FWHM ~1200 km/s) emission lines of H and He superimposed atop a blue continuum.
