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Classification of ASASSN-16bc and ASASSN-16bb as Type Ia SNe

ATel #8634; A. S. Piascik, I. A. Steele (Liverpool JMU)
on 4 Feb 2016; 09:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iain Steele (iainsteele@mac.com)

Subjects: Optical, Supernovae, Transient

We report spectra obtained in the visible, 400-800nm, with resolution R~350, using the SPRAT spectrograph on the Liverpool Telescope located at Roque de los Muchachos. Classification was done using SNID (Blondin and Tonry 2007, ApJ, 666, 1024).

We conducted a spectroscopic observation of transient ASASSN-16bc (AT2016zd) at 2016-02-04T03:21:58 UT. This transient was identified by the All Sky Automated Survey for SuperNovae (ASAS-SN) in ATel #8628 with a discovery date 2016-02-02. We find a close match with SN2006ax at -8 days with an estimated red-shift of z=0.033. The estimated red-shift is close to that of the proposed host galaxy 2MASX J12052488-2123572, z=~0.032 (SIMBAD). The velocity of the ejecta estimated from the Si II absorption feature at 635.5 nm is estimated to be ~11,100 km/s.

We conducted a spectroscopic observation of transient ASASSN-16bb (AT2016zc, Gaia16abk) at 2016-02-04T05:38:30 UT. This transient was observed by the Gaia Photometric Science survey on 2016-01-28. The All Sky Automated Survey for SuperNovae (ASAS-SN) detected the object on 2016-01-31 and issued alert ATel #8621. We find a close match with SN2001eh, a sub-type Ia-91T, at -2 days with an estimated red-shift of z=0.035. The estimated red-shift is close to that of the proposed host galaxy SDSS J140557.36+435257.2, z=0.034. The velocity of the ejecta estimated from the Si II absorption feature at 635.5 nm is estimated to be ~10,500 km/s.

Liverpool Telescope