Spectral classifications of Gaia16alk (AT2016brw) as type II SN and AT2016brv as type Ia SN
ATel #8985; A. S. Piascik, I. A. Steele (Liverpool JMU)
on 25 Apr 2016; 10:50 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iain Steele (iainsteele@mac.com)
Subjects: Optical, Supernovae, Transient
We conducted a spectroscopic observation of transient Gaia16alk (AT2016brw) at 2016-04-24T01:58:41 UT. This transient was observed by the Gaia Photometric Science survey on 2016-04-18T09:16:07 UT at position RA = 17:08:26.60, DEC = 25:30:51.00.
Classification using SNID (Blondin and Tonry 2007, ApJ, 666, 1024) indicates it is a type II supernova. We find a close match with SN2005cs at +2 days with a SNID estimated red-shift of z=0.007. The transient is 0.0306 arcmin from the proposed host galaxy UGC 1072, red-shift 0.0097 (source NED).
We conducted a spectroscopic observation of transient AT2016brv at 2016-04-23T22:05:52 UT. This transient was observed by the Tsinghua-NAOC Transient Survey (TNTS) on 2016-04-16T12:46:49 UT at position RA = 12:05:14.48, DEC = 10:36:55.40. Classification using SNID (Blondin and Tonry 2007, ApJ, 666, 1024) indicates it is a type Ia supernova, probably a 91bg sub-type. We find a good match with SN20016hb at +8 day with at SNID estimated red-shift of z=0.034. The transient is 0.167 arcmin from the proposed host galaxy, NGC 4083, redshift z=0.033416 (source NED). The ejecta velocity estimated from the Si II 635.3nm absorption feature
is ~10,200 km/s.
Both spectra were obtain in the visible, 400-800nm, with resolution R~350, using the SPRAT spectrograph on the Liverpool Telescope located at Roque de los Muchachos, La Palma.
Liverpool Telescope
