Spectroscopic Classifications of Optical Transients with Mayall/KOSMOS
ATel #9361; C. D. Kilpatrick, M. R. Siebert, R. J. Foley (UCSC), Y.-C. Pan (Illinois), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 10 Aug 2016; 19:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Charles Kilpatrick (charlesk@email.arizona.edu)
Subjects: Optical, Supernovae
We report the following classifications of optical transients from spectroscopic observations with KOSMOS on the KPNO Mayall 4-m telescope. Targets were supplied by Shunsuke Nagata, POSS, and ASAS-SN. All observations were made on 2016 Aug 10 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
AT2016epw | 02:15:02.06 | +18:15:18.60 | 0.035 | II | -5 d | (1)
AT2016evd | 22:28:27.70 | +22:24:44.00 | | | | (2)
AT2016eve | 23:28:27.70 | +22:24:44.00 | 0.012 | | | (3)
ASASSN-16iq | 23:55:07.63 | -31:34:39.02 | 0.03 | Ia | -4 | (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) The velocity of the H alpha line is approximately -6,500 km/s.
(2) Nothing visible in image of field. The coordinates are exactly one hour in right ascension off (and exactly the same declination) as AT2016evd. Both objects were submitted to TNS by Shunpike Nagata at the same time, and we believe that AT2016evd is likely the result of a typo.
(3) Blue featureless spectrum.
(4) ASASSN-16iq is heavily reddened with a Na D equivalent width of 2.4 A. The SN is similar to SN 1991T-like objects, but there are some spectral matches to the high-luminosity SN 2006gz (Hicken et al., ApJL, 669, 17, 2007). We measure a Si II 6355 velocity of -12,100 km/s.
