Characterizing the Rapid Hydrogen Disappearance in SN2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties
Creators: name: Dong, Yize
name: Valenti, Stefano
name: Ashall, Chris
name: Williamson, Marc
name: Sand, David J.
name: Van Dyk, Schuyler D.
name: Filippenko, Alexei V.
name: Jha, Saurabh W.
name: Lundquist, Michael
name: Modjaz, Maryam
name: Andrews, Jennifer E.
name: Jencson, Jacob E.
name: Hosseinzadeh, Griffin
name: Pearson, Jeniveve
name: Kwok, Lindsey A.
name: Boland, Teresa
name: Hsiao, Eric Y.
name: Smith, Nathan
name: Elias-Rosa, Nancy
name: Srivastav, Shubham
name: Smartt, Stephen
name: Fulton, Michael
name: Zheng, WeiKang
name: Brink, Thomas G.
name: Shahbandeh, Melissa
name: Bostroem, K. Azalee
name: Hoang, Emily
name: Janzen, Daryl
name: Mehta, Darshana
name: Meza, Nicolas
name: Shrestha, Manisha
name: Wyatt, Samuel
name: Auchettl, Katie
name: Burns, Christopher R.
name: Farah, Joseph
name: Galbany, L.
name: Gonzalez, Estefania Padilla
name: Haislip, Joshua
name: Hinkle, Jason T.
name: Howell, D. Andrew
name: De Jaeger, Thomas
name: Kouprianov, Vladimir
name: Kumar, Sahana
name: Lu, Jing
name: McCully, Curtis
name: Moran, Shane
name: Morrell, Nidia
name: Newsome, Megan
name: Pellegrino, Craig
name: Polin, Abigail
name: Reichart, Daniel E.
name: Shappee, B. J.
name: Stritzinger, Maximilian D.
name: Terreran, Giacomo
name: Tucker, M. A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present optical and near-infrared observations of SN~2022crv, a stripped envelope supernova in NGC~3054, discovered within 12 hrs of explosion by the Distance Less Than 40 Mpc Survey. We suggest SN~2022crv is a transitional object on the continuum between SNe Ib and SNe IIb. A high-velocity hydrogen feature ($\sim$$-$20,000 -- $-$16,000 $\rm km\,s^{-1}$) was conspicuous in SN~2022crv at early phases, and then quickly disappeared around maximum light. By comparing with hydrodynamic modeling, we find that a hydrogen envelope of $\sim 10^{-3}$ \msun{} can reproduce the behaviour of the hydrogen feature observed in SN~2022crv. The early light curve of SN~2022crv did not show envelope cooling emission, implying that SN~2022crv had a compact progenitor with extremely low amount of hydrogen. The analysis of the nebular spectra shows that SN~2022crv is consistent with the explosion of a He star with a final mass of $\sim$4.5 -- 5.6 \msun{} that has evolved from a $\sim$16 -- 22 \msun{} zero-age main sequence star in a binary system with about 1.0 -- 1.7 \msun{} of oxygen finally synthesized in the core. The high metallicity at the supernova site indicates that the progenitor experienced a strong stellar wind mass loss. In order to retain a small amount of residual hydrogen at such a high metallicity, the initial orbital separation of the binary system is likely larger than $\sim$1000~$\rm R_{\odot}$. The near-infrared spectra of SN~2022crv show a unique absorption feature on the blue side of He I line at $\sim$1.005~$μ$m. This is the first time that such a feature has been observed in a Type Ib/IIb, and could be due to \ion{Sr}{2}. Further detailed modelling on SN~2022crv can shed light on the progenitor and the origin of the mysterious absorption feature in the near infrared.
description: accepted for publication in ApJ