Spectroscopic Classifications of Optical Transients with the Lick Shane telescope

ATel #10559; C. Rojas-Bravo, E. Xhakaj, Y.-C. Pan, C. D. Kilpatrick, R. J. Foley (UCSC)
on 7 Jul 2017; 04:41 UT
Credential Certification: Yen-Chen Pan (ypan6@ucsc.edu)

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We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. Targets were supplied by ASAS-SN, ATLAS, Gaia, and POSS. All observations were made on 2017 July 3 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type    | Phase | Notes
 
ATLAS17hls  | AT2017eww | 14:11:33.07 | +02:28:32.21 | 0.053 | Ia      | +3 d  | (1)  
ASASSN-17ir | AT2017fbr | 15:40:59.69 | +51:26:16.53 | 0.037 | Ia      | +8 d  |  
AT2017fbs   | AT2017fbs | 15:23:19.51 | +08:36:58.60 | 0.036 | Ia      | -5 d  | (2) 
Gaia17bqy   | AT2017fbv | 12:20:19.90 | +41:36:48.96 | 0.046 | IIn/Ibn |       | (3) 

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 measure an Si II 6355 velocity of -10,800 km/s. (2) We measure an Si II 6355 velocity of -12,800 km/s. (3) We classify the object as a SN IIn, but with relatively strong He I lines. This is reminiscent of 'transitional' SNe Ibn (e.g., Pastorello et al., 2008, MNRAS, 389, 131).