SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy
Year: 2026
Type: article
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.
Authors: Callum Aster, Cosimo Inserra, Andrea Pastorello, Joseph P Anderson, Franz Erik Bauer, K Azalee Bostroem, Kenneth C Chambers, Ting-Wan Chen, Joseph R Farah, Morgan Fraser, Dino Pierluigi Fugazza, Mariusz Gromadzki, Claudia P Gutiérrez, D Andrew Howell, Erkki Kankare, Tom L Killestein, Niilo Koivisto, Giorgos Leloudas, J D Lyman, Kyle Medler, Shane Moran, Tomás E Müller-Bravo, Giuliano Pignata, Miika Pursiainen, Fabio Ragosta, Andrea Reguitti, Jesper Sollerman, Giorgio Valerin, Ben Warwick, David R Young
Institutions: Cardiff University, Osservatorio Astronomico di Padova, European Southern Observatory, European Southern Observatory, University of Tarapacá, University of Arizona, University of Hawaiʻi at Mānoa, National Central University, Las Cumbres Observatory Global Telescope Network, University of California, Santa Barbara, University College Dublin, Brera Astronomical Observatory, National Institute for Astrophysics, University of Warsaw, Institute of Space Sciences, Institut d'Estudis Espacials de Catalunya, Universitat Politècnica de Catalunya, University of Turku, University of Warwick, DTU Space, Technical University of Denmark, University of Leicester, Trinity College Dublin, Arturo Prat University, Astronomical Observatory of Capodimonte, University of Naples Federico II, Stockholm University, AlbaNova, Queen's University Belfast
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,046
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, John Templeton Foundation, Villum Fonden, University of Portsmouth, UK Research and Innovation, National Astronomical Research Institute of Thailand, National Energy Research Scientific Computing Center, Leverhulme Trust, University of Leicester, University of Warwick, National Stroke Foundation, Monash University, Chinese Academy of Sciences, Generalitat de Catalunya, Nuclear Safety and Security Commission, Ministry of Education, India, Ministerio de Ciencia e Innovación, 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, European Research Council, Agencia Estatal de Investigación, Division of Astronomical Sciences, High Energy Physics
Awards: G1039895795, The Gravitational wave Optical Transient Observer, INSTITUTO MILENIO DE ASTROFISICA, G1682311667, Warwick Astronomy and Astrophysics Consolidated Grant 2020-2023, G1800429324, G1813527838, G1903188662, G1969000501, G2005372553, G2064873908, G2245903464, G2262748287, G2318220113, NEO DISCOVERY AND CHARACTERIZATION WITH THE PAN-STARRS PS1 TELESCOPE. WE WILL USE THE PAN-STARRS PS1 TELESCOPE SYSTEM TO RAPIDLY SURVEY LARGE AREAS O, G2428672771, G2462415295, G2495621129, G2720911013, G272672434, G2835226076, G3005324705, G300979063, G3204085874, G3459355364, G3480869486, G3534859928, G3619454252, G3754922453, CDS&E: WoU-MMA: The Treasure Map, G3897114864, G4173533787, G425668148, G430777504, G4392917094, G464105488, G4655338613, Speeding up the messenger: immediate detection of multimessenger transients with Las Cumbres Observatory, THE POWER OF THE PAN-STARRS1 TELESCOPE TO DISCOVER NEOS HAS BEEN AMPLY DEMONSTRATED WITH THE CURRENT 11% DEDICATED ALLOCATION OF OBSERVING TIME SUPPO, G498139845, G5080475149, G5545544880, G5826275554, G5834573078, The Gravitational wave Optical Transient Observer, STFC Warwick 2022 DTP, G608468438, G617610489, Elucidating Desert Microbial Strategies for Critical Material Acquisition through Spatial Metabolomics and Multi-Omics, G6388644901, G6513613686, A NEO SEARCH PROGRAM USING THE PAN-STARRS PS1 TELESCOPETHE GOAL OF THE PROPOSED RESEARCH IS TO USE T, G7065484253, Management and Operations of the National Optical Astronomy Observatory, G7406122311, G7861570460, SPECTRO-TEMPORAL STUDIES OF AGN POPULATIONS, G823181903, G8380168758, G8511709958, THE OBJECTIVE OF THIS PROPOSAL IS TO SIGNIFICANTLY UPGRADE THE PAN-STARRS TELESCOPE SYSTEM ON HALEAKALA, MAUI BY COMPLETING THE INSTRUMENTATION AND C, CENTRO DE ASTROFISICA Y TECNOLOGIAS AFINES (CATA), G8898961300, Establishing a Templeton LSST Early-Career Research Fellowship, G969889393, WE PROPOSE TO CONTINUE OUR SURVEY TO DISCOVER NEAR EARTH OBJECTS (NEOS) WITH THE PAN-STARRS SYSTEM EXPANDED TO INCLUDE THE PAN-STARRS2 OBSERVATORY (PS2) TOGETHER WITH THE PAN-STARRS1 OBSERVATORY (PS1). SINCE THE START OF DEDICATED USE OF PAN- STARRS FOR NEO DISCOVERY IN SPRING OF 2014 PS1 HAS DISCOVERED OVER 40% OF ALL NEOS AND OVER 50% OF THE LARGER NEOS AND POTENTIALLY HAZARDOUS ASTEROIDS. PS1 IS ALSO THE LEADING DISCOVERY TELESCOPE FOR NEOS LARGER THAN 1 KM IN DIAMETER. WITH PS2 WE WILL AT LEAST DOUBLE OUR RAW SURVEY POWER. THE PAN-STARRS2 OBSERVATORY IS COMPLETE AND WE EXPECT TO COMPLETE ITS CAMERA (GPC2) SOON AND ADD SCIENCE OPERATIONS WITH PS2 TO THE ONGOING PS1 SURVEY. PS2 WILL BE IN FULL SCIENCE OPERATIONS BY THE START OF THE PERIOD OF PERFORMANCE OF THIS PROPOSAL. THE PS2 OPTICS ARE SUPERIOR TO THOSE OF PS1 AND WE HAVE ELIMINATED THE CAUSE OF CORRELATED READ NOISE THAT AFFLICTS FAINT OBJECTS IN THE CAMERA ON PS1. THUS WE EXPECT PS2 TO BE SLIGHTLY SUPERIOR TO PS1 IN DISCOVERING NEOS. THE PAN-STARRS SYSTEM WITH BOTH PS1 AND PS2 WILL CHANGE THE LANDSCAPE OF NEO DISCOVERY. WE CAN DOUBLE THE AREA SURVEYED OR PERFORM SELF FOLLOW-UP OBSERVATIONS WHICH WILL SIGNIFICANTLY DECREASE THE NUMBER OF OBJECTS LOST DUE TO AN ABSENCE OF FOLLOW-UP. MORE SELF-FOLLOW-UP WILL ALSO AVOID BIASES INTRODUCED BY THE DIGEST SCORE AND PROVIDE A MORE SYSTEMATIC SURVEY. WE WILL INVESTIGATE WIDE AREA SURVEY STRATEGIES RANGING BETWEEN THESE TWO EXTREMES TO OPTIMIZE FOR THE MOST COMPLETE NEO SURVEY AND TO REDUCE LOSSES OF RARE OR CAMOUFLAGED NEOS THAT WE ARE CURRENTLY UNDER-SAMPLING. IN ADDITION TO BRINGING THE SURVEY POWER OF PS2 ON LINE WE HAVE IDENTIFIED PROMISING AVENUES WHERE WE CAN IMPROVE OUR DISCOVERY RATE BY ADVANCES IN SOFTWARE INCLUDING IMPROVED DE-TRENDING ASTROMETRY OBJECT DETECTION IMAGE SUBTRACTION AND MACHINE LEARNING TECHNIQUES. FINALLY WE HAVE AN EXPERIENCED TEAM WITH A PROVEN RECORD OF SUCCESS., G988696487
OpenAlex ID: W7131669990