SN 2022jox: An extraordinarily ordinary Type II SN with Flash Spectroscopy
arxiv(2023)
摘要
We present high cadence optical and ultraviolet observations of the Type II
supernova (SN), SN 2022jox which exhibits early spectroscopic high ionization
flash features of H1, He2, C4, and N4 that
disappear within the first few days after explosion. SN 2022jox was discovered
by the Distance Less than 40 Mpc (DLT40) survey ∼0.75 days after explosion
with followup spectra and UV photometry obtained within minutes of discovery.
The SN reached a peak brightness of M_V ∼ -17.3 mag, and has an
estimated ^56Ni mass of 0.04 M_⊙, typical values for normal Type II
SNe. The modeling of the early lightcurve and the strong flash signatures
present in the optical spectra indicate interaction with circumstellar material
(CSM) created from a progenitor with a mass loss rate of Ṁ∼
10^-3-10^-2 M_⊙ yr^-1. There may also be some indication
of late-time CSM interaction in the form of an emission line blueward of
Hα seen in spectra around 200 days. The mass-loss rate is much higher
than the values typically associated with quiescent mass loss from red
supergiants, the known progenitors of Type II SNe, but is comparable to
inferred values from similar core collapse SNe with flash features, suggesting
an eruptive event or a superwind in the progenitor in the months or years
before explosion.
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