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Spectroscopic Classifications of Optical Transients with SOAR

ATel #10582; M. R. Siebert, D. A. Coulter, C. D. Kilpatrick, Y.-C. Pan, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 18 Jul 2017; 22:07 UT
Credential Certification: Yen-Chen Pan (ypan6@ucsc.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 ATLAS, POSS, PSST, and P. Cacella. All observations were made on 2017 July 18 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type  | Phase |  Notes
ATLAS17iky | AT2017ffv | 13:57:21.74 | -34:46:24.46 | 0.014 | Ia | -1 d | (1) PS17dpd | AT2017ffm | 23:18:23.02 | -04:24:58.27 | 0.024 | II | | (2) PS17dpn | AT2017fgk | 17:47:49.19 | +16:08:05.18 | 0.034 | Ic-BL | | ATLAS17ioc | AT2017fle | 14:47:45.90 | -40:24:34.37 | 0.069 | Ia | +5 d | (3) AT2017fmr | AT2017fmr | 20:01:07.66 | -44:18:33.33 | 0.0 | CV | | AT2017fms | AT2017fms | 21:20:14.60 | -04:52:51.30 | 0.030 | Ia | -12 d | (4) ATLAS17ipa | AT2017fmz | 22:00:51.39 | -01:50:24.27 | 0.028 | Ia | -5 d | (5)

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 Si II 6355 velocity of -12,800 km/s. (2) We measure a H alpha velocity velocity of -5,000 km/s. (3) SN 2006gz-like object. We measure a Si II 6355 velocity of -10,300 km/s. (4) The C II 6580 absorption is visible in the spectrum. We measure Si II 6355 and C II 6580 velocities of -12,400 km/s and -12,900 km/s, respectively. (5) We measure a Si II 6355 velocity of -11,600 km/s.