Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
ATel #14387; G. Dimitriadis, R. J. Foley (UCSC)
on 11 Feb 2021; 23:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Georgios Dimitriadis (gdimitri@ucsc.edu)
Subjects: Optical, Supernovae
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. Targets were supplied by ATLAS and ZTF (as reported by ALeRCE). All observations were made on 2021 Feb 11 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS21dia | AT2021bls | 16:43:20.73 | +61:35:41.52 | 0.019 | Ia | +15d | (1)
ATLAS21dkm | AT2021bmu | 01:18:04.56 | +14:33:13.23 | 0.053 | Ia | +25d | (2)
ZTF21aahduvm | AT2021bwv | 10:10:27.43 | +02:13:41.30 | 0.022 | II | peak | (3)
ZTF21aagxmcs | AT2021cca | 10:16:19.31 | -01:47:14.90 | 0.085 | Ia | -5d | (4)
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) Good fits with SNe Ia 91bg-like spectra ~2 weeks after maximum light. (2) The spectrum is red, with no indication of dust extinction, based on the absence of a strong NaID doublet. Some good matches with 91bg-like SNe Ia. (3) We measure an H alpha velocity of -8,300 km/s. (4) We measure an Si II 6355 velocity of -10,600 km/s.
