Classification of Supernova in M82 as a young, reddened Type Ia Supernova

ATel #5786; Y. Cao (Caltech), M. M. Kasliwal (Carnegie/Princeton), A. McKay (UT Austin), A. Bradley (APO) report on behalf of the intermediate Palomar Transient Factory Collaboration

on 22 Jan 2014; 08:47 UT

Credential Certification: Yi Cao (ycao@astro.caltech.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 5789, 5791, 5793, 5794, 5795, 5797, 5798, 5799, 5800, 5804, 5808, 5809, 5811, 5812, 5824, 5835, 5840, 5876, 6099, 6197

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At UT 2014 Jan 22.305, we obtained a spectrum of PSN_J09554214+6940260 (discoverer: S. J. Fossey) with the Dual Imaging Spectrograph on the ARC 3.5m telescope. We classify this as a Type Ia supernova with a Si II velocity of 20000 km/s. The best superfit match is SN2002bo at -14d. The supernova has a red continuum and deep Na D absorption.

We further note that at UT 2014 Jan 21.158, the supernova is visible in Palomar 48-inch images but it is too saturated to measure a magnitude. iPTF upper limits (R=20.4 mag) are prior to Jan 13.

Panchromatic follow-up is encouraged.