Spectroscopic classification of transients with the Lick Shane telescope

ATel #15353; S. Tinyanont, A. Dhara, K. Taggart, K. W. Davis, R. J. Foley (UCSC)
on 28 Apr 2022; 21:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Samaporn Tinyanont (stinyanont@ucsc.edu)

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We report the following classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2022 April 27 UT. The targets were supplied by ATLAS and ZTF. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)   | Dec (J2000)  |   z    | Type   | Phase | Notes
 
ATLAS22mhs  | AT2022hss | 12:25:38.388 | +07:11:33.07 | 0.0247 | II     |       | (1) 
ATLAS22mqi  | AT2022idx | 12:53:12.208 | -06:23:06.86 | 0.0141 | Ia-91T | -15   |  
ZTF22aahhzqi| AT2022ies | 16:27:33.522 | +46:38:09.47 | 0.0684 | Ia     | -5    | (2) 
ZTF22aahhgjh| AT2022ihb | 13:46:13.414 | +23:05:11.03 | 0.0300 |        |       | (3) 
ZTF22aahnkdv| AT2022iid | 18:15:38.661 | +73:08:05.87 | 0.014  |        |       | (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) The spectrum has two strong absorption features near the wavelength of H-alpha. The redder feature is consistent with photospheric H-alpha P-Cygni absorption at -8,000 km/s. The bluer component is consistent with either high-velocity H-alpha absorption at -17,500 km/s or a strong Si II absorption at -8,000 km/s. (2) We measure a Si II velocity of -10,000 km/s. (3) Blue featureless continuum. (4) The spectrum is blue and relatively featureless. The redshift of z = 0.014 is estimated by assuming that a weak narrow emission line in the spectrum is H alpha from the host galaxy. Assuming that redshift, there is a broad emission feature around 4600 A in the observer frame.