Guti´errez, C P and Sullivan, M and Desai, Shantanu and et al, .
(2020)
DES16C3cje: A low-luminosity, long-lived supernova.
arXiv.org.
Abstract
We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN.
The spectra are characterized by extremely narrow photospheric lines corresponding
to very low expansion velocities of . 1500 km s−1
, and the light curve shows an initial
peak that fades after 50 days before slowly rebrightening over a further 100 days to
reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light
curve is then slower than that expected from the powering by radioactive decay of 56Co,
but is comparable to that expected from accretion power. Comparing the bolometric
light curve with hydrodynamical models, we find that DES16C3cje can be explained
by either i) a low explosion energy (0.11 foe) and relatively large 56Ni production of
0.075 M� from a ∼ 15 M� red supergiant progenitor typical of other SNe II, or ii) a
relatively compact ∼ 40 M� star, explosion energy of 1 foe, and 0.08 M� of 56Ni. Both
scenarios require additional energy input to explain the late-time light curve, which is
consistent with fallback accretion at a rate of ∼ 0.5 × 10−8 M� s
−1
.
Actions (login required)
 |
View Item |
Altmetric
Altmetric