(Proposal ID) S14B-142

(PI) Maeda Keiichi

(Proposal Title)
 NIR Spectroscopy of SN Ia 2014J in M82: Explosion Physics and Diversities

(Abstract)
We propose to take a J-, H-, and K-band spectrum of Type Ia Supernova (SN Ia) 
2014J in M82 at ~ 1 year after the discovery. Thanks to its vicinity (~ 3.5 
Mpc), nearest SN Ia since 1986, SN 2014J is an ideal target for the NIR late-
time spectroscopic follow-up. The late-time NIR spectroscopy of extragalactic 
SNe is an yet unexplored field, for which we have been trying to increase the 
samples but still are limited to the nearest SNe even with the Laser Guide 
Star - Adaptive Optics (LGS-AO) attached with Subaru. The late-time NIR 
spectral features are sensitive to the yet-unresolved explosion physics, and 
provide powerful diagnostics to the origins of observational diversity, i.e., 
one limiting factor in the use of SNe Ia as precise cosmological distance 
indicators. SN 2014J represents a quite different case in the SN properties 
and extinction as compared to a few previous late-time NIR samples, showing 
high expansion velocity and very large extinction with E(B-V) > 1 mag. As 
such, the late-time NIR spectrum of this SN will provide a strong hint on 
the explosion physics and its relation to the observational diversities.