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Spectroscopic Classifications of Optical Transients with Mayall/KOSMOS

ATel #10041; C. D. Kilpatrick, Y.-C. Pan, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 2 Feb 2017; 19:26 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), the ATLAS project (ATel #8680), and the Pan-STARRS Survey for Transients (PSST). Observations were made on 2017 Feb 1 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name | RA (J2000)  | Dec (J2000)  | z     | Type | Phase | Notes
ATLAS17aup | AT2017zg | 09:41:54.49 | +01:19:08.43 | 0.022 | II | +19d | ASASSN-17bt | AT2017yt | 09:44:11.46 | +32:50:36.53 | 0.045 | Ia | +5d | (1) PS17aig | AT2017uq | 12:14:25.15 | -02:03:25.80 | 0.079 | Ia | +13d | PS17agy | AT2017tn | 13:04:59.52 | -05:53:54.60 | 0.224 | Ia | -2d | (2) ATLAS17and | AT2017pl | 14:59:30.78 | +46:37:58.07 | 0.097 | Ia | +3d | (3) ASASSN-17bs | AT2017yh | 17:52:06.25 | +21:33:58.32 | 0.020 | Ia | -6d | (4)

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 -8,800 km/s.
(2) Assuming LCDM with H0=70 km/s/Mpc, m - M = 39.80. NED reports MW extinction in PS1 w band is 0.084. The w band absolute magnitude for the latest PS1 photometry is therefore -19.2.
(3) We infer z=0.097 from potential host galaxy 2MASX J14593040+4637433 in NED, but the SN spectrum matches better with z~0.11 based on SNID.
(4) We measure a Si II 6355 velocity of -11,300 km/s.