SN 2024abfo: a partially stripped SN II from a yellow supergiant

Abstract

We present photometric and spectroscopic data of the type IIb supernova (SN) 2024abfo in NGC 1493 (at 11 Mpc). The ATLAS survey discovered the object just a few hours after the explosion, and observed a fast rise on the first day. Signs of the sharp shock break-out peak and the subsequent cooling phase are observed in the ultraviolet and the bluest optical bands in the first couple of days, while no peak is visible in the reddest filters. Subsequently, in analogy with normal SNe IIb, the light curve of SN 2024abfo rises again in all bands to the broad peak, with the maximum light reached around one month after the explosion. Its absolute magnitude at peak is $M_r=-16.5\pm 0.1$ mag, making it a faint SN IIb. The early spectra are dominated by Balmer lines with broad P-Cygni profiles indicating ejecta velocity of 22,500 km/s. One month after the explosion, the spectra display a transition towards being He-dominated, though the H lines do not completely disappear, supporting the classification of SN 2024abfo as a relatively H-rich SN IIb. We identify the progenitor of SN 2024abfo in archival images of the Hubble Space Telescope, the Dark Energy Survey, and the XMM-Newton space telescope, in multiple optical filters. From its spectral energy distribution, the progenitor is consistent with being a yellow supergiant, having an initial mass of 15 $M_{\odot }$. This detection supports an emerging trend of SN IIb progenitors being more luminous and hotter than SN II ones, and being primaries of massive binaries. Within the SN IIb class, fainter events such as SN 2024abfo tend to have cooler and more expanded progenitors than luminous SNe IIb.

9 pages, 9 figures, 4 tables, accepted for publication on A&A

References in corpus (18)

• Binary interaction dominates the evolution of massive stars
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• The chemical make-up of the Sun: A 2020 vision
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• Optical Spectra of 73 Stripped-Envelope Core-Collapse Supernovae
• The type IIb SN 2008ax: the nature of the progenitor
• Investigating the properties of stripped-envelope supernovae, what are the implications for their progenitors?
• Uncovering the Putative B-Star Binary Companion of the SN 1993J Progenitor
• SN 2013df, a double-peaked IIb supernova from a compact progenitor and an extended H envelope
• The Dependence of Theoretical Synthetic Spectra on $\alpha$-enhancement in Young, Binary Stellar Populations
• The progenitor and early evolution of the Type IIb SN 2016gkg
• Radii and Mass-loss Rates of Type IIb Supernova Progenitors
• A Shock Flash Breaking Out of a Dusty Red Supergiant
• Supernova 2010as: the Lowest-Velocity Member of a Family of Flat-Velocity Type IIb Supernovae
• On the Progenitor of the Type IIb Supernova 2016gkg
• The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
• Updated Photometry of the Yellow Supergiant Progenitor and Late-time Observations of the Type IIb Supernova 2016gkg

Cited by in corpus (8)

• Painting a Family Portrait of the Yellow Super- and Hypergiants in the Milky Way I. Constraining the Distances and Luminosities
• SN2017ckj: A linearly declining Type IIb supernova with a relatively massive hydrogen envelope
• SN 2024iss: A Double-peaked Type IIb Supernova with Evidence of Circumstellar Interaction
• SN 2022ngb: A faint, slowly evolving Type IIb supernova with a low-mass envelope
• A low mass, binary-stripped envelope for the Type IIb SN 2024abfo
• SN 2017ati: A luminous type IIb explosion from a massive progenitor
• SN 2024hpj: A perspective on SN 2009ip-like events
• Another one bites the dust -- how red supergiants keep surprising us