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Spectroscopic Classifications of Optical Transients with SOAR

ATel #7375; 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 13 Apr 2015; 01:46 UT
Credential Certification: Ryan Foley (rfoley@illinois.edu)

Subjects: Optical, Supernovae, Transient

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 All-Sky Automated Survey for Supernovae (ASAS-SN). All observations were made on 2015 April 9 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name             | RA (J2000)  | Dec (J2000) |  z    | Type | Phase          |  Notes
ASSASN-15go | 06:11:30.50 | -16:29:03.5 | 0.019 | Ia | -3d | (1) PS15yn | 14:08:43.54 | -26:30:34.2 | 0.11 | IIn | | PS15yo | 14:11:03.99 | -26:05:12.8 | 0.08 | Ia | +8d | (2) PS15zd | 15:07:49.77 | +02:13:55.0 | 0.091 | Ia | -2d | (3) PS15ze | 15:32:52.10 | -15:16:54.4 | 0.025 | Ibc? | +1-2 months | (4) PS15zf | 16:57:00.72 | +18:29:03.5 | 0.052 | II | +1-2 months | (5) PS15zg | 17:08:31.96 | +21:20:26.6 | 0.058 | ? | | (6) PS15zn | 10:49:50.23 | +17:52:59.9 | 0.055 | Ia | -8d | (7) PS15zp | 10:56:31.51 | +23:40:26.2 | | ? | | (8)

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) Independently classified by Childress et al. (ATEL #7368). We measure a Si II 6355 velocity of -13,400 km/s. (2) Independently classified by Childress et al. (ATEL #7368). We measure a Si II 6355 velocity of -9,600 km/s. (3) We measure a Si II 6355 velocity of -12,800 km/s. (4) Classified as a SN II by Le Guillou et al. (ATEL #7102). We find better matches to SNe Ib and Ic than SNe II, although we cannot rule out a SN II(b) classification. (5) Independently classified by Cartier et al. (ATEL #7363). (6) Spectrum is dominated by the host galaxy light. (7) 91T-like spectrum (8) The spectrum shows a blue continuum.