SN2023fyq: A Type Ibn Supernova With Long-standing Precursor Activity Due to Binary Interaction

• DOI: 10.48550/arxiv.2405.04583
• Publication Date: 2024-05-07
• Authors: Yize Dong; D. Tsuna; S. Valenti; David J. Sand; Jennifer E. Andrews; K. Azalee Bostroem; G. Hosseinzadeh; Emily Hoang; Saurabh W. Jha; Daryl Janzen; J. Jencson; M. Lundquist; Darshana Mehta; Aravind P. Ravi; N. Meza; Jeniveve Pearson; Manisha Shrestha; A. Z. Bonanos; D. A. Howell; Nathan Smith; Joseph Farah; D. Hiramatsu; K. Itagaki; C. McCully; Megan Newsome; E. P. González; E. Paraskeva; C. Pellegrino; G. Terreran; J. Haislip; Vladimir Kouprianov; D. Reichart
• Keywords: High Energy Astrophysical Phenomena (astro-ph.HE); FOS: Physical sciences; Circumstellar matter; Astrophysics; 01 natural sciences; QB460-466; Astrophysics - Solar and Stellar Astrophysics; Stellar mass loss; 0103 physical sciences; Core-collapse supernovae; Astrophysics - High Energy Astrophysical Phenomena; Solar and Stellar Astrophysics (astro-ph.SR)

We present photometric and spectroscopic observations of SN 2023fyq, a type Ibn supernova in the nearby galaxy NGC 4388 (D$\simeq$18~Mpc). In addition, we trace long-standing precursor emission at position 2023fyq using data from DLT40, ATLAS, ZTF, ASAS-SN, Swift, amateur astronomer Koichi Itagaki. Precursor activity is observed up to nearly three years before explosion, with relatively rapid rise final 100 days. The double-peaked post-explosion light curve reaches luminosity $\sim10^{43}~\rm erg\,s^{-1}$. strong intermediate-width He lines nebular spectrum imply interaction still active late phases. found that best explained by mass transfer binary system involving low-mass star compact companion. An equatorial disk likely formed this process ($\sim$0.6$\rm M_{\odot}$), ejecta powers main peak supernova. early reveals presence dense extended material ($\sim$0.3$\rm M_{\odot}$) $\sim$3000$\rm R_{\odot}$ ejected weeks due final-stage core silicon burning or runaway resulting orbital shrinking, leading rising within $\sim$30 days prior explosion. explosion could be triggered either core-collapse merger object. along 2018gjx 2015G, forms unique class Type SNe which originate systems are exhibit detectable long-lasting pre-explosion outbursts magnitudes ranging $-$10 $-$13.