TY - JOUR
T1 - Luminous Type II Short-plateau SN 2023ufx
T2 - Asymmetric Explosion of a Partially Stripped Massive Progenitor
AU - Ravi, Aravind P.
AU - Valenti, Stefano
AU - Dong, Yize
AU - Hiramatsu, Daichi
AU - Barmentloo, Stan
AU - Jerkstrand, Anders
AU - Bostroem, K. Azalee
AU - Pearson, Jeniveve
AU - Shrestha, Manisha
AU - Andrews, Jennifer E.
AU - Sand, David J.
AU - Hosseinzadeh, Griffin
AU - Lundquist, Michael
AU - Hoang, Emily
AU - Mehta, Darshana
AU - Meza Retamal, Nicolás
AU - Martas, Aidan
AU - Jha, Saurabh W.
AU - Janzen, Daryl
AU - Subrayan, Bhagya
AU - Howell, D. Andrew
AU - McCully, Curtis
AU - Farah, Joseph
AU - Newsome, Megan
AU - Padilla Gonzalez, Estefania
AU - Terreran, Giacomo
AU - Andrews, Moira
AU - Filippenko, Alexei V.
AU - Brink, Thomas G.
AU - Zheng, Weikang
AU - Yang, Yi
AU - Vinkó, Jozsef
AU - Wheeler, J. Craig
AU - Smith, Nathan
AU - Rho, Jeonghee
AU - Könyves-Tóth, Réka
AU - Gutiérrez, Claudia P.
N1 - Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
PY - 2025/3/20
Y1 - 2025/3/20
N2 - We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration (tPT ∼ 47 days), a luminous V-band peak (MV = −18.42 ± 0.08 mag), and a rapid early decline rate (s1 = 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 MZAMS ∼ 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 (56Ni) ∼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 ( M H env ∼ 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] λλ6300, 6364, Hα, and [Ca ii] λλ7291, 7323 suggest that the explosion of SN 2023ufx could be inherently asymmetric, preferentially ejecting material along our line of sight.
AB - We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration (tPT ∼ 47 days), a luminous V-band peak (MV = −18.42 ± 0.08 mag), and a rapid early decline rate (s1 = 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 MZAMS ∼ 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 (56Ni) ∼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 ( M H env ∼ 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] λλ6300, 6364, Hα, and [Ca ii] λλ7291, 7323 suggest that the explosion of SN 2023ufx could be inherently asymmetric, preferentially ejecting material along our line of sight.
UR - https://www.scopus.com/pages/publications/105000284969
UR - https://www.scopus.com/pages/publications/105000284969#tab=citedBy
U2 - 10.3847/1538-4357/adb0bb
DO - 10.3847/1538-4357/adb0bb
M3 - Article
AN - SCOPUS:105000284969
SN - 0004-637X
VL - 982
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 12
ER -