Spectroscopic classification of LSQ transients

ATel #5329; D. Wright, J. Polshaw, M. Fraser, S. J. Smartt, R. Kotak, K. Smith, D. Young, C. Inserra, M. Nicholl (Queen's University Belfast), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, E. S. Walker (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley)
on 27 Aug 2013; 14:53 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cosimo Inserra (c.inserra@qub.ac.uk)

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We report the optical spectroscopic classification of four supernovae candidates. The targets were supplied by the La Silla-Quest survey (see Hadjiyska et al., ATel #3812). All observations were performed on 25th Aug 2013 with the 4.2m William Herschel Telescope using ISIS, with R300B (3300 - 6000A, 3.4A resolution), R158R (5250 - 9746A, 7.2A resolution) and a dichroic at 5300A. Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383).

  
Name             | RA (J2000)   | Dec (J2000)  | Disc. Date | Disc. Source | Disc Mag  |  z     |   Type  | Phase  | Notes 
 
LSQ13bvs         | 20:36:55.12  | -31:37:50.4  | 2013-08-25 |     LSQ      | 18.04     | ~0.034 | SN?     |  ---   | (1) 
LSQ13bug         | 21:09:04.08  | -26:54:19.8  | 2013-08-25 |     LSQ      | 20.11     | ~0.015 | SN Ia   |  ~-6   | (2) 
LSQ13bsu         | 22:34:05.67  | 11:47:57.1   | 2013-08-25 |     LSQ      | 19.72     | ~0.133 | SN Ia   |  ~+2   | (3) 
LSQ13bwe         | 23:27:44.59  | -04:22:11.5  | 2013-08-25 |     LSQ      | 18.79     | ~0.150 | SN Ia   |  ~max  | (4) 
LSQ13btb         | 21:38:24.46  | -13:07:36.4  | 2013-08-25 |     LSQ      | 21.29     | ~0.089 | Galaxy  |  N/A   | (5) 

(1) The spectrum shows a mostly featureless blue continuum, with possible weak broad absorption in the blue. The detection of the h-alpha emission line of the host galaxy corresponds to a redshift of z=0.034.

(2) Best match with several normal SNe Type Ia approximately 1 week before maximum light.

(3) Best match with several normal SNe Type Ia at just after maximum light.

(4) Best match with several normal SNe Type Ia at approximately maximum light.

(5) The spectrum shows several galaxy emission (H-alpha, O[III], N[II] S[II]) and absorption (CaII H&K, G-band, MgIb 5175, NaI 5890,5896) features which all agree on a redshift of z=0.089.