Dramatic Rebrightening of the Type-changing Stripped-envelope Supernova SN 2023aew

• DOI: 10.3847/1538-4357/ad3758
• Publication Date: 2024-05-08T15:25:02Z
• Authors: Yashvi Sharma; Jesper Sollerman; Shrinivas R. Kulk...; Takashi J. Moriya; Steve Schulze; Stan Barmentloo; Michael Fausnaugh; Avishay Gal-Yam; Anders Jerkstrand; Tomás Ahumada; Eric C. Bellm; Kaustav K. Das; Andrew Drake; Christoffer Fremling; David Hale; Saarah Hall; K. R. Hinds; Theophile Jegou d...; Viraj Karambelkar; Mansi M. Kasliwal; Frank J. Masci; Adam A. Miller; Guy Nir; Daniel A. Perley; Josiah N. Purdum; Yu-Jing Qin; Nabeel Rehemtulla; R. Michael Rich; Reed L. Riddle; Antonio C. Rodriguez; Sam Rose; Jean Somalwar; Jacob L. Wise; Avery Wold; Lin Yan; Yuhan Yao
• Keywords: Envelope (radar); Balmer series; Pair-instability supernova

Abstract Multipeaked supernovae with precursors, dramatic light-curve rebrightenings, and spectral transformation are rare, but being discovered in increasing numbers by modern night-sky transient surveys like the Zwicky Transient Facility. Here, we present observations analysis of SN 2023aew, which showed a increase brightness following an initial luminous (−17.4 mag) long (∼100 days) unusual first peak (possibly precursor). 2023aew was classified as Type IIb supernova during changed its type to resemble stripped-envelope (SESN) after marked rebrightening. We comparisons 2023aew’s evolution SESN subtypes argue that it is similar SNe Ibc main peak. P-Cygni Balmer lines peak, vanish second peak’s photospheric phase, before H α resurfaces again nebular phase. The ([O i ], [Ca ii Mg ) exhibit double-peaked structure hints toward clumpy or nonspherical ejecta. analyze light curve find be broader than normal SESNe well requiring very high 56 Ni mass power luminosity. discuss possible origins including eruption scenario where part envelope ejected also powers through interaction circumstellar medium.