Spectroscopic Classification of Astrophysical Transients with the Lick Shane Telescope
ATel #17054; K. W. Davis, R. J. Foley (UCSC)
on 27 Feb 2025; 19:47 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 February 27 UT. The targets were supplied by YSE, ZTF, and SGLF (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
PS25sw | AT2025btv | 03:10:12.413 | +02:04:12.35 | 0.029 | Ia | +5d | (1)
ZTF25aaggnvd | AT2025ced | 14:17:37.549 | +07:03:29.15 | 0.028821 | II | +15d |
ZTF25aahrlwa | AT2025cuf | 09:13:46.458 | +34:50:21.98 | 0.023717 | Ia | -10d | (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) We measure a Si II 6355 velocity of -9,800 km/s.
(2) We measure a host redshift from our spectrum consistent with that reported in NED. However, we find that the SN has matches only to young SNe Ia at z < 0.01. Using the reported host redshift, we measure a Si II 6355 velocity of -25,000 km/s.
