Early color photometry of a possible type Iax supernova 2023mnc: inferring the distance and progenitor constraints
Name
10509_2023_4250_ReferencePDF.pdf
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Author(s)
Yang, Thomas Z.
Zhang, Maureen
Shen, Tianran
Jiang, Justin
Faison, Michael
Warrener, Michael
Zheng, Tai
Date Issued
November 7, 2023
Publisher
Springer Netherlands
Citation
Astrophysics and Space Science. 2023 Nov 07;368(11):93
Version
Author's final manuscript
Abstract
Abstract
Early-time radioactive signals from type Ia supernovae (SNeIa) can provide important constraints on the explosion mechanism and the progenitor system. We present observations and analysis of SN 2023mnc, a SN Ia,
∼
7
$\sim 7$
days following its discovery. Follow-up observations were conducted in optical bands, covering phases from
∼
−
4
$\sim -4$
days to
∼
15
$\sim 15$
days relative to its r-band peak luminosity. The early photometry allows us to estimate the physical properties of the ejecta and characterize the possible divergence from a normal SN Ia; we were able to characterize it as a Type Iax supernova instead. The estimated date of explosion is
t
0
=
60130
$t_{0}=60130$
MJD and implies a short rise time of
t
r
i
s
e
≈
16
$t_{rise} \approx 16$
days. The apparent g-band peak magnitude and the post-peak decline rate are
m
m
a
x
(
g
)
=
−
19.52
±
0.47
$m_{max}(g)=-19.52\pm 0.47$
mag and
Δ
m
15
(
g
)
=
0.825
±
1.635
$\Delta m_{15}(g)=0.825\pm 1.635$
mag, respectively. Based on the light curve fitting of standard SN Ia models, the distance modulus is predicted to be
37.98
±
0.207
$37.98\pm 0.207$
mag for g-band measurements, and the SN is predicted to be
394.46
±
38
$394.46\pm 38$
Mpc from Earth. Assuming a 56Ni powered radiative diffusion, the estimated bolometric light-curve peaks at
3.8
×
10
41
$3.8 \times 10^{41}$
erg s−1 and indicates that only
0.017
M
⊙
$0.017 M_{\odot }$
of 56Ni was produced, making SN 2023mnc a moderate luminosity object in the Iax class with peak absolute magnitude of
M
V
=
−
15.3
$M_{V}=-15.3$
mag. Comparing the observed color evolution with the predicted by different models such as deflagration-to-detonation transition and pure-deflagration scenario, the latter one is favored. The photometry of SN 2023mnc offers a unique opportunity to examine the progenitor systems and ignition process of the SNe Iax, adding weight to the population study of such sub-class SNe.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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DOI of Published Version
https://doi.org/10.1007/s10509-023-04250-x
