Spectroscopic Classifications of Optical Transients with the Keck I telescope

ATel #11169; G. Dimitriadis, M. R. Siebert, R. J. Foley (UCSC)
on 15 Jan 2018; 12:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (foley@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 PSST and ASAS-SN. All observations were obtained on 2018 Jan 15 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type | Phase | Notes
 
PS18ej      | AT2018fy  | 09:53:20.04 | -18:25:09.30 | 0.012 |  II  |       |  
ASASSN-18an | AT2018gl  | 09:58:06.25 | +10:21:33.84 | 0.018 |  Ia  |  -4 d | (1) 

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) Similar to SN 1986G and other "transitional" SNe Ia. We measure an Si II 6355 velocity of -11,500 km/s. We detect a subtle absorption feature at ~6350 A, which may be caused by C II 6580 at -10,600 km/s. The cool photosphere and possible carbon detection are both notable features of the peculiar SN 2006bt (Foley et al., 2010, ApJ, 708, 1748).