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 \ion{H}{1}, \ion{He}{2}, \ion{C}{4}, and \ion{N}{4} 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 MV∼−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 M˙∼10−3−10−2M⊙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.
@article{arxiv.2310.16092,
title = {SN 2022jox: An extraordinarily ordinary Type II SN with Flash Spectroscopy},
author = {Jennifer E. Andrews and Jeniveve Pearson and Griffin Hosseinzadeh and K. Azalee Bostroem and Yize Dong and Manisha Shrestha and Jacob E. Jencson and David J. Sand and S. Valenti and Emily Hoang and Daryl Janzen and M. J. Lundquist and Nicolas Meza and Samuel Wyatt and Saurabh W. Jha and Chris Simpson and Joseph Farah and Estefania Padilla Gonzalez and D. Andrew Howell and Curtis McCully and Megan Newsome and Craig Pellegrino and Giacomo Terreran},
journal= {arXiv preprint arXiv:2310.16092},
year = {2024}
}