Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor

Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), a luminous V -band peak ( M V = −​​​​​​18.42 ± 0.08 mag), and a rapid early decline rate ( s 1 = 3.47 ± 0.09 mag (50 days) −1 ). By comparing observed photometry to a hydrodynamic MESA+STELLA model grid, we constrain the progenitor to be a massive red supergiant with M ZAMS ∼ 19–25 M ⊙ . Independent comparisons with nebular spectral models also suggest an initial He-core mass of ∼6 M ⊙ , and thus a massive progenitor. For a Type IIP, SN 2023ufx produced an unusually high amount of nickel ( 56 Ni) ∼0.14 ± 0.02 M ⊙ , during the explosion. We find that the short plateau duration in SN 2023ufx can be explained with the presence of a small hydrogen envelope ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:msub> <mml:mi mathvariant="normal">H</mml:mi> <mml:mi>env</mml:mi> </mml:msub> </mml:msub> </mml:math> ∼ 1.2 M ⊙ ), suggesting partial stripping of the progenitor. About ∼0.09 M ⊙ of circumstellar material through mass loss from late-time stellar evolution of the progenitor is needed to fit the early time (≲10 days) pseudo-bolometric light curve. Nebular line diagnostics of broad and multipeak components of [O i ] λλ 6300, 6364, H α , and [Ca ii ] λλ 7291, 7323 suggest that the explosion of SN 2023ufx could be inherently asymmetric, preferentially ejecting material along our line of sight.

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Publication Details

Journal
The Astrophysical Journal
Published
2025-03-11
DOI
https://doi.org/10.3847/1538-4357/adb0bb
Citations
9
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
10.39
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article

Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor

Moira Andrews, M. Lundquist, Yi Yang, Daryl Janzen et al.
9 citations
The Astrophysical Journal
Gamma-ray bursts and supernovae
10.39
article

Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor

Moira Andrews, M. Lundquist, Yi Yang, Daryl Janzen, Stan Barmentloo, Saurabh W. Jha, Nathan Smith, Jeniveve Pearson, Aravind P. Ravi, Anders Jerkstrand, Jennifer E. Andrews, József Vinkó, D. Hiramatsu, G. Hosseinzadeh, A. V. Filippenko, Estefania Padilla Gonzalez, J. C. Wheeler, Réka Könyves-Tóth, Yize Dong, Emily Hoang, S. Valenti, Joseph Farah, David J. Sand, Darshana Mehta, Jeonghee Rho, WeiKang Zheng, N. Meza, G. Terreran, C. McCully, Bhagya Subrayan, C. P. Gutiérrez, Thomas G. Brink, Megan Newsome, D. A. Howell, Manisha Shrestha, Aidan Martas, K. Azalee Bostroem
article en
9 citations

Abstract

Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), a luminous V -band peak ( M V = −​​​​​​18.42 ± 0.08 mag), and a rapid early decline rate ( s 1 = 3.47 ± 0.09 mag (50 days) −1 ). By comparing observed photometry to a hydrodynamic MESA+STELLA model grid, we constrain the progenitor to be a massive red supergiant with M ZAMS ∼ 19–25 M ⊙ . Independent comparisons with nebular spectral models also suggest an initial He-core mass of ∼6 M ⊙ , and thus a massive progenitor. For a Type IIP, SN 2023ufx produced an unusually high amount of nickel ( 56 Ni) ∼0.14 ± 0.02 M ⊙ , during the explosion. We find that the short plateau duration in SN 2023ufx can be explained with the presence of a small hydrogen envelope ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:msub> <mml:mi mathvariant="normal">H</mml:mi> <mml:mi>env</mml:mi> </mml:msub> </mml:msub> </mml:math> ∼ 1.2 M ⊙ ), suggesting partial stripping of the progenitor. About ∼0.09 M ⊙ of circumstellar material through mass loss from late-time stellar evolution of the progenitor is needed to fit the early time (≲10 days) pseudo-bolometric light curve. Nebular line diagnostics of broad and multipeak components of [O i ] λλ 6300, 6364, H α , and [Ca ii ] λλ 7291, 7323 suggest that the explosion of SN 2023ufx could be inherently asymmetric, preferentially ejecting material along our line of sight.

The Astrophysical JournalVol. 982(1)
Openalex Percentile: Top 2%
Gamma-ray bursts and supernovae
10.39
DOIOpen Access PDFOpenAlex
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