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Spectroscopic Classifications of Optical Transients with Mayall/KOSMOS

ATel #10032; C. D. Kilpatrick, Y.-C. Pan, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 31 Jan 2017; 22:15 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Charles Kilpatrick (cdkilpat@ucsc.edu)

Subjects: Optical, Supernovae, Transient

We report the following classifications of optical transients from spectroscopic observations with KOSMOS on the KPNO Mayall 4-m telescope. Targets were supplied by the All-Sky Automated Survey for Supernovae (ASAS-SN) and the ATLAS project (ATel #8680). Observations were made on 2017 Jan 31 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name | RA (J2000) | Dec (J2000) | z | Type  | Phase | Notes
ATLAS17arb | AT2017ya | 00:16:44.48 | +15:20:31.52 | 0.070 | Ia | -5d | (1) ATLAS17are | AT2017yc | 01:32:34.02 | +32:18:47.23 | 0.070 | | | (2) ATLAS17amz | AT2017pn | 04:46:24.59 | -11:59:18.25 | 0.014 | II-P | +3d | (3) ASASSN-17bq | AT2017xx | 07:25:38.14 | +59:00:10.57 | 0.044 | Ia | +19d| ATLAS17apo | AT2017vh | 08:24:53.33 | -04:39:06.52 | 0.069 | Ia | +13d| ASASSN-17bn | AT2017vu | 08:59:23.92 | -09:52:29.32 | 0.045 | Ia | +8d | ATLAS17asj | AT2017yk | 09:44:31.77 | -12:18:29.59 | 0.046 | Ia | -1d | (4) ATLAS17arc | AT2017yd | 10:55:59.27 | +11:55:15.11 | 0.078 | Ia | +7d | ATLAS17amc | AT2017oz | 14:06:41.58 | +30:19:07.49 | 0.056 | Ia | -4d | (5) ASASSN-17br | AT2017xy | 15:52:00.35 | +66:18:53.17 | 0.026 | II-P | +12d| ASASSN-17bh | AT2017po | 16:03:51.71 | +39:59:25.40 | 0.032 | Ia | +2d | (6)

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 -12,700 km/s.
(2) The spectrum exhibits featureless red continuum.
(3) We measure an Hbeta velocity of -11,500 km/s.
(4) We measure a Si II 6355 velocity of -10,600 km/s.
(5) We measure a Si II 6355 velocity of -13,900 km/s.
(6) We measure a Si II 6355 velocity of -12,400 km/s.