Additional and Updated Spectroscopic Classification of Optical Transients with the Lick Shane telescope
ATel #15096; M. J. Bustamante-Rosell, S. Tinyanont, R. J. Foley (UCSC)
on 9 Dec 2021; 03:52 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Maria Jose Bustamante-Rosell (majoburo@gmail.com)
Subjects: Optical, AGN, Supernovae
We report additional and updated (Bustamante-Rosell et al ATel #15089) classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 December 6 UT. The targets were supplied by the Young Supernova Experiment and GAIA. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
Gaia21fhb | AT2021afkg | 09:36:17.49 | +09:18:14.69 | 0.130 | | | (1)
PS21mxv | AT2021afkm | 01:27:35.21 | +03:29:21.21 | 0.113 | Ia | +3d | (2)
PS21ndh | AT2021afra | 21:40:25.82 | +08:18:29.29 | 0.087 | Ia | -1d | (3)
Notes:
(1) AT2021afkg has a blue continuum and broad emission lines consistent with those of a Seyfert galaxy. The spectrum is bluer than an archival SDSS spectrum of the nucleus with consistent H-alpha FWHM of 4,700 km/s. The flux increase in recent weeks would correspond to a M ~ -22 mag object, ruling out nearly all known supernovae and tidal disruption events. AT2021afkg may represent an exceptional accretion event.
(2) We measure a Si II velocity of -10,300 km/s.
(3) We measure a Si II velocity of -10,000 km/s.
