Spectroscopic Classifications of Optical Transients with SOAR

ATel #8151; R. J. Foley, R. Hounsell, J. A. Miller, Y.-C. Pan (Illinois), A. Rest (STScI), S. W. Jha (Rutgers), 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 11 Oct 2015; 16:59 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (rfoley@illinois.edu)

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We report the following classifications of optical transients from spectroscopic observations with the Goodman spectrograph (wavelength range 3300 - 7100 A) on the SOAR telescope. Targets were supplied by the Pan-STARRS Survey for Transients (PSST). All observations were made on 2015 Oct 11 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name    | RA (J2000)  | Dec (J2000) |  z    | Type | Phase |  Notes
 
PS15ces | 01:38:44.68 | -23:07:34.5 | 0.134 | IIn  |    | (1) 
PS15cfn | 21:59:21.97 | -21:07:10.7 | 0.11  | Ia   | -2 | (2) 
PS15cgc | 23:12:55.84 | +00:21:55.2 | 0.049 | II-p |    | (3) 
PS15cge | 23:35:20.90 | +01:10:32.4 | 0.085 | Ia   | -3 | (4) 
PS15cgi | 21:21:25.73 | -12:28:04.2 | 0.079 | Ia   | +4 | (5) 
 

Notes: (1) PS15ces is a luminous SN IIn. At z = 0.134 (measured from narrow [O II]), it has M_i < -20.0 mag. The SN appears to still be rising and may be much brighter at peak. The H beta line has two velocity components with FWHM of 520 km/s and 3300 km/s, respectively. Its host galaxy, APMUKS(BJ) B013622.97-232246.6, is low luminosity, being M ~ -19.3 mag. (2) Similar to SN 1999aa. We measure a Si II 6355 velocity of -10,300 km/s. (3) Similar to SN 1987A soon after explosion. This is consistent with the rising light curve from Pan-STARRS. We measure an H-alpha velocity of -12,600 km/s. (4) We measure a Si II 6355 velocity of -11,200 km/s. (5) Similar to SN 1991bg. We measure a Si II 6355 velocity of -10,400 km/s. 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.