SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy

ABSTRACT We present spectroscopic and photometric observations and analysis of SN 2024abvb, a peculiar transitional Type Ibn/Icn supernova located at an unusually large projected distance from its host galaxy (21.5 kpc). SN 2024abvb displays an extended rise time in the g and o bands (10.1 and 10.6 d, respectively), followed by a linear decline in all photometric bands. Comparisons with other supernova subclasses show that the photometric and spectroscopic evolution of SN 2024abvb are distinct from Type Ibn and Type Icn events, with a higher peak r-band luminosity and lower blackbody temperatures. Spectra reveal an initial blue continuum and narrow P-Cygni profiles, with C ii $\lambda$5890 dominating in emission, persisting at late phases, and showing a rapid decline in the expansion velocity. Weak He i $\lambda$5876 features are tentatively detected at early times. Analysis of progenitor scenarios rules out thermonuclear origins based on incompatible light-curve shapes and spectral signatures. A rare massive star progenitor appears unlikely given the low local star formation rate. The most plausible origin is an ultra-stripped supernova scenario involving a binary system; this best explains the observed separation from the host, the low circumstellar material mass, the fast photometric evolution and the low nickel production, although a discrepancy in model versus observed ejecta mass remains. These results reinforce the classification of SN 2024abvb as a distinctive Type Ibn/Icn event and highlight the diversity of progenitor channels for interacting supernovae.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2026-02-26
DOI
https://doi.org/10.1093/mnras/stag404
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
0.00

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article

SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy

K. Medler, M. Pursiainen, G. Valerin, F. E. Bauer et al.
Monthly Notices of the Royal Astronomical Society
Gamma-ray bursts and supernovae
article

SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy

K. Medler, M. Pursiainen, G. Valerin, F. E. Bauer, D. R. Young, J. P. Anderson, Ben Warwick, M. Fraser, C. Inserra, G. Pignata, Joseph Farah, Fabio Ragosta, Niilo Koivisto, Andrea Pastorello, Ting-Wan Chen, Tom Killestein, Erkki Kankare, Jesper Sollerman, Dino Pierluigi Fugazza, Andrea Reguitti, Callum Aster, K Azalee Bostroem, D Andrew Howell, Kenneth C Chambers, J D Lyman, Tomás E Müller-Bravo
article en

Abstract

ABSTRACT We present spectroscopic and photometric observations and analysis of SN 2024abvb, a peculiar transitional Type Ibn/Icn supernova located at an unusually large projected distance from its host galaxy (21.5 kpc). SN 2024abvb displays an extended rise time in the g and o bands (10.1 and 10.6 d, respectively), followed by a linear decline in all photometric bands. Comparisons with other supernova subclasses show that the photometric and spectroscopic evolution of SN 2024abvb are distinct from Type Ibn and Type Icn events, with a higher peak r-band luminosity and lower blackbody temperatures. Spectra reveal an initial blue continuum and narrow P-Cygni profiles, with C ii $\lambda$5890 dominating in emission, persisting at late phases, and showing a rapid decline in the expansion velocity. Weak He i $\lambda$5876 features are tentatively detected at early times. Analysis of progenitor scenarios rules out thermonuclear origins based on incompatible light-curve shapes and spectral signatures. A rare massive star progenitor appears unlikely given the low local star formation rate. The most plausible origin is an ultra-stripped supernova scenario involving a binary system; this best explains the observed separation from the host, the low circumstellar material mass, the fast photometric evolution and the low nickel production, although a discrepancy in model versus observed ejecta mass remains. These results reinforce the classification of SN 2024abvb as a distinctive Type Ibn/Icn event and highlight the diversity of progenitor channels for interacting supernovae.

Monthly Notices of the Royal Astronomical SocietyVol. 547(3)
University College Dublin (IE), University of Hawaiʻi at Mānoa (US), Queen's University Belfast (GB), Las Cumbres Observatory Global Telescope Network (US), Institute of Space Sciences (ES), University of Arizona (US), University of Leicester (GB), University of California, Santa Barbara (US), University of Turku (FI), University of Tarapacá (CL), Trinity College (CA), Trinity College Dublin (IE), National Central University (TW), Astronomical Observatory of Capodimonte (IT), Brera Astronomical Observatory (IT), Department of Space (IN), University of Warwick (GB), Institut d'Estudis Espacials de Catalunya (ES), Catalyst (GB), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Institute of Astronomy (RU), European Southern Observatory (CL), AlbaNova (SE), Astronomical Observatory (RS), Osservatorio Astronomico di Padova (IT), University of Warsaw (PL), University of Naples Federico II (IT), Cardiff University (GB), Arturo Prat University (CL), Universitat Politècnica de Catalunya (ES)
National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, John Templeton Foundation, University of Portsmouth, UK Research and Innovation, National Astronomical Research Institute of Thailand, National Energy Research Scientific Computing Center, University of Leicester, University of Warwick, Monash University, Chinese Academy of Sciences, Nuclear Safety and Security Commission, Ministry of Education, India, Turun Yliopisto, Fondation Merac, Agencia Nacional de Investigación y Desarrollo, National Science and Technology Council, Instituto de Astrofísica de Canarias, Office of Science, HORIZON EUROPE Framework Programme, Science and Technology Facilities Council, Division of Astronomical Sciences, High Energy Physics
Openalex Percentile: Top 42%
Gamma-ray bursts and supernovae
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