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FLOYDS Classification of MASTER OT J221829.51-024708.5 as a Peculiar Type Ia Supernova

ATel #8021; G. Hosseinzadeh, S. Valenti (LCOGT/UCSB), Y. Yang (Texas A&M), D. A. Howell, C. McCully, I. Arcavi (LCOGT/UCSB)
on 9 Sep 2015; 00:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iair Arcavi (iarcavi@lcogt.net)

Subjects: Optical, Supernovae

We obtained a spectrum of MASTER OT J221829.51-024708.5 (ATel #8009) on 2015 September 8.4 UT with the robotic FLOYDS instrument mounted on the Faulkes Telescope North. Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find a good fit to the luminous, carbon-rich Type Ia SN 2006gz (Hicken et al. 2007, ApJ, 669L, 17) 4 days after maximum light at redshift z=0.094. At this redshift, images taken by LCOGT on 2015 September 8.16 UT show the supernova at an r-band absolute magnitude of about -19.7, which further supports the claim that this object lies on the luminous end of the distribution of Type Ia supernovae.