Spectroscopic Classifications of Optical Transients with the Keck I telescope

ATel #13497; M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)
on 18 Feb 2020; 01:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Georgios Dimitriadis (gdimitri@ucsc.edu)

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We report the following classifications of optical transients from spectroscopic observations with the LRIS spectrograph on the Keck I telescope. Targets were supplied by YSE and ZTF. All observations were obtained on 2020 Feb 16 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name  | RA (J2000)  | Dec (J2000)  |   z    | Type |   Phase   | Notes
 
PS20es       | AT2019uit | 12:50:16.09 | +21:20:15.40 | 0.071  | IIn  | post-peak | (1) 
PS20je       | AT2020azk | 13:02:47.93 | -05:02:30.22 | 0.087  | Ib   | post-peak | 
ZTF20aangkoo | AT2020cnn | 09:56:16.83 | +69:41:41.94 | 0.0008 | Nova |           | (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 identify 3 components in the Halpha profile, with FWHMs of 280, 1840 and 8300 km/s, respectively. (2) Faint transient (~20.5 mag) in M82. The spectrum shows several emission lines at the host's redshift, including H alpha (FWHM ~ 1900 km/s), oxygen and nitrogen and is generally consistent with being a nova. Assuming a distance modulus to M82 of 27.8 mag, the transient has an approximate absolute magnitude of -7.3.