Spectroscopic Classifications of Optical Transients with the Lick Shane telescope

ATel #13167; T. Hung and R. J. Foley (UCSC)
on 6 Oct 2019; 00:18 UT
Credential Certification: Tiara Hung (tiarahung@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 ATLAS, Pan-STARRS, and ZTF. All observations were made on 2019 Oct 05 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name         | IAU Name  | RA (J2000)  | Dec (J2000)   |   z    | Type   | Phase        | Notes
 
PS19fpv      | AT2019rho | 02:12:49.19  | -06:42:06.00 | 0.017  |  II    | before peak  | (1)  
 
ATLAS19xfk   | AT2019rsn | 01:35:45.71  | +45:33:49.23 | 0.101  |  Ia    | -4 d         | (2)  
 
ZTF19acbwouf | AT2019rqe | 00:13:07.18  | +27:52:49.68 | 0.03   |  II    | before peak  |      
 
PS19fsm      | AT2019rsq | 03:14:37.73  | -07:00:44.77 | 0.031? |  IIb?  | before peak  | (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 a H-beta velocity of -9900 km/s. (2) We measure a Si II 6355 velocity of -9300 km/s. (3) The spectrum has some similarity to SNe IIb at the redshift of the nearby galaxy SDSS J031437.61-070052.2 (z=0.031, confirmed from narrow emission features in the SN spectrum). At this redshift, a broad absorption feature at a rest-frame wavelength of ~6100 A could correspond to H alpha at a velocity of -21,600 km/s or Si II 6355 at a velocity of -11,900 km/s. However, there is no obvious H beta absorption. If the redshift is ignored, the spectrum resembles a SNe Ic-BL at a redshift of ~0.1. Although a background SN seems unlikely given its position, additional observations will be necessary for a definitive classification.