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Spectroscopic Classifications of Optical Transients with SOAR

ATel #8546; R. A. Hounsell, J. A. Miller, Y.-C. Pan, R. J. Foley (Illinois), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP), K. W. Smith, D. Wright, S. J. Smartt (QUB), M. Huber, K. C. Chambers, H. Flewelling, M. Willman, N. Primak, A. Schultz, B. Gibson, E. Magnier, C. Waters, J. Tonry, R. J. Wainscoat (IfA, Hawaii)
on 15 Jan 2016; 06:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (rfoley@illinois.edu)

Subjects: Optical, Supernovae

We report the following classifications of optical transients from spectroscopic observations with the Goodman spectrograph on the Southern Astrophysical Research (SOAR) telescope. Targets were supplied by the Pan-STARRS Survey for Transients (PSST) and BOSS (http://bosssupernova.com). All observations were made on 2016 Jan 14 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
 
Name          | RA (J2000)   | Dec (J2000)    | UT     |  z      | Type  | Phase       |  Notes 

AT 2016D | 04:01:25.99 | -54:45:30.8 | 02:13 | 0.045 | Ia | +20 d | PS16hy | 08:10:19.86 | +19:26:48.2 | 02:37 | 0.103 | Ibn | | (1) PS16jb | 09:17:34.63 | +18:57:07.0 | 03:51 | 0.03 | IIP | post max | PS16ij | 10:17:07.04 | +15:48:35.9 | 04:29 | 0.094 | IIn | +8 d | (2) PS16hx | 07:45:43.36 | +31:00:27.8 | 05:13 | 0.062 | II | | (3) PS16gs | 10:34:19.27 | +03:24:25.5 | 05:55 | 0.074 | IIb | +4 d | (4) PS16gy | 11:17:05.67 | -05:31:13.7 | 07:08 | 0.01 | IIP | +3 d |

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) The spectrum has clear relatively narrow (FWHM = 950 km/s) He I 5876 emission on top of a broader base. No broad H beta emission is detected. We detect narrow H beta, but its width (FWHM = 300 km/s) is at the resolution of the spectrograph. Along with narrow [O II] and [O III] emission, the H beta is most likely galactic emission and unrelated to the SN.

(2) We measure a FWHM = 2,100 km/s for the H-beta narrow emission.

(3) We measure a H-alpha velocity = -11,200 km/s.

(4) We measure a H-alpha velocity = -11,700 km/s.