Abstract:
We present optical photometric (up to
∼
410 d since
B
max
) and spectroscopic (up to
∼
157 d
since
B
max
) observations of a Type Iax supernova (SN) 2014dt located in M61. SN 2014dt is
one of the brightest and closest (
D
∼
20 Mpc) discovered Type Iax SN. It best matches the
light-curve evolution of SN 2005hk and reaches a peak magnitude of
M
B
∼−
18.13
±
0.04 mag
with
m
15
∼
1.35
±
0.06 mag. The early spectra of SN 2014dt are similar to other Type Iax
SNe, whereas the nebular spectrum at 157 d is dominated by narrow emission features with
less blending as compared to SNe 2008ge and 2012Z. The ejecta velocities are between 5000
and 1000 km s
−
1
, which also confirms the low-energy budget of Type Iax SN 2014dt compared
to normal Type Ia SNe. Using the peak bolometric luminosity of SN 2005hk, we estimate the
56
Ni mass of
∼
0.14 M
. The striking similarity between SN 2014dt and SN 2005hk implies
that a comparable amount of
56
Ni would have been synthesized in the explosion of SN 2014dt.
