A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy
Tekijät: Aster, Callum; Inserra, Cosimo; Pastorello, Andrea; Anderson, Joseph P.; Bauer, Franz Erik; Bostroem, K. Azalee; Chambers, Kenneth C.; Chen, Ting-Wan; Farah, Joseph R.; Fraser, Morgan; Fugazza, Dino Pierluigi; Gromadzki, Mariusz; Gutierrez, Claudia P.; Howell, D. Andrew; Kankare, Erkki; Killestein, Tom L.; Koivisto, Niilo; Leloudas, Giorgos; Lyman, J. D.; Medler, Kyle; Moran, Shane; Muller-Bravo, Tomas E.; Pignata, Giuliano; Pursiainen, Miika; Ragosta, Fabio; Reguitti, Andrea; Sollerman, Jesper; Valerin, Giorgio; Warwick, Ben; Young, David R.
Kustantaja: Oxford University Press (OUP)
Julkaisuvuosi: 2026
Lehti: Monthly Notices of the Royal Astronomical Society
Artikkelin numero: stag404
Vuosikerta: 547
Numero: 3
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stag404
Julkaisun avoimuus kirjaamishetkellä: Avoimesti saatavilla
Julkaisukanavan avoimuus : Kokonaan avoin julkaisukanava
Verkko-osoite: https://doi.org/10.1093/mnras/stag404
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/523515344
Rinnakkaistallenteen lisenssi: CC BY
Rinnakkaistallennetun julkaisun versio: Kustantajan versio
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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Julkaisussa olevat rahoitustiedot:
CI gratefully acknowledges the support received from the MERAC Foundation. TEMB is funded by Horizon Europe ERC grant no. 101125877. JRF is supported by the U.S. National Science Foundation (NSF) Graduate Research Fellowship Program under grant 2139319. CPG acknowledges financial support from the Secretary of Universities and Research (Government of Catalonia) and by the Horizon 2020 Research and Innovation Programme of the European Union under the Marie Sklodowska-Curie and the Beatriu de Pinos 2021 BP 00168 programme, from the Spanish Ministerio de Ciencia e Innovacion (MCIN) and the Agencia Estatal de Investigacion (AEI) 10.13039/501100011033 under the PID2023-151307NB-I00 SNNEXT project, from Centro Superior de Investigaciones Cientificas (CSIC) under the PIE project 20215AT016 and the programme Unidad de Excelencia Maria de Maeztu CEX2020-001058-M, and from the Departament de Recerca i Universitats de la Generalitat de Catalunya through the 2021-SGR-01270 grant. TLK acknowledges support via a Warwick Astrophysics prize post-doctoral fellowship made possible thanks to a generous philanthropic donation. GL was supported by a research grant (VIL60862) from VILLUM FONDEN. SM is funded by Leverhulme Trust grant RPG-2023-240. MP acknowledges support from a UK Research and Innovation Fellowship (MR/T020784/1 and UKRI1062). Based on observations collected at Copernico and Schmidt telescopes (Asiago Mount Ekar, Italy) of the INAF-Osservatorio Astronomico di Padova. AR acknowledges financial support from the GRAWITA Large Program Grant (PI P. D'Avanzo). AR, AP, GV acknowledge financial support from the PRIN-INAF 2022 'Shedding light on the nature of gap transients: from the observations to the models' BW acknowledges the UKRI's STFC studentship grant funding, project reference ST/X508871/1 FEB acknowledges support from ANID-Chile BASAL CATA FB210003, FONDECYT Regular 1241005, and Millennium Science Initiative, AIM23-0001. T-WC acknowledges support from the Ministry of Education Yushan Fellow Programme (MOE-111-YSFMS-0008-001-P1) and from the National Science and Technology Council, Taiwan (NSTC 114-2112-M-008-021-MY3). GV and AR acknowledge financial support from the SOXS project (PIS. Campana). This article is also based on observations obtained from the La Silla Observatory with the REM telescope, under the program REM AOT47-37 (ID 49337, PI: G. Valerin). KAB is supported by an LSST-DA Catalyst Fellowship; this publication was thus made possible through the support of Grant 62192 from the John Templeton Foundation to LSST-DA. JDL acknowledges support from a UK Research and Innovation Future Leaders Fellowship (grant references MR/T020784/1 and UKRI1062). Based on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere, Chile, as part of ePESSTO+ (the advanced Public ESO Spectroscopic Survey for Transient Objects Survey-PI: Inserra). ePESSTO + observations were obtained under ESO programme ID 112.25JQ. This work makes use of data from the Asteroid Terrestrial-impact Last Alert System (ATLAS) project. The ATLAS project is primarily funded by NASA grants. The Gravitational-wave Optical Transient Observer (GOTO) project acknowledges the support of the Monash-Warwick Alliance; University of Warwick; Monash University; University of Sheffield; University of Leicester; Armagh Observatory & Planetarium; the National Astronomical Research Institute of Thailand (NARIT); Instituto de Astrofisica de Canarias (IAC); University of Portsmouth; University of Turku; University of Manchester and the UK Science and Technology Facilities Council (STFC, grant numbers ST/T007184/1, ST/T003103/1, and ST/T000406/1). This article includes observations made in the Two-meter Twin Telescope (TTT) in the Teide Observatory of the IAC, that Light Bridges operates in the Island of Tenerife, Canary Islands (Spain). The Observing Time Rights (DTO) used for this research were provided by Light Bridges, SL. This paper uses data that were obtained by The Legacy Surveys: the Dark Energy Camera Legacy Survey (DECaLS; NOAO Proposal ID # 2014B-0404; PIs: David Schlegel and Arjun Dey), the Beijing-Arizona Sky Survey (BASS; NOAO Proposal ID # 2015A-0801; PIs: Zhou Xu and Xiaohui Fan), and the Mayall z-band Legacy Survey (MzLS; NOAO Proposal ID # 2016A-0453; PI: Arjun Dey). DECaLS, BASS and MzLS together include data obtained, respectively, at the Blanco telescope, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory (NOAO); the Bok telescope, Steward Observatory, University of Arizona; and the Mayall telescope, Kitt Peak National Observatory, NOAO. NOAO is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Please see http://legacysurvey.org for details regarding the Legacy Surveys. BASS is a key project of the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences (the Strategic Priority Research Programme 'The Emergence of Cosmological Structures' Grant No. XDB09000000), and the Special Fund for Astronomy from the Ministry of Finance. The BASS is also supported by the External Cooperation Program of Chinese Academy of Sciences (Grant No. 114A11KYSB20160057) and Chinese National Natural Science Foundation (Grant No. 11433005). The Legacy Surveys imaging of the DESI footprint is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No . DE-AC02-05CH1123, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; and by the U.S. National Science Foundation, Division of Astronomical Sciences under Contract No.AST-0950945 to the National Optical Astronomy Observatory. The VISTA Hemisphere Survey data products served at Astro Data Lab are based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 179.A-2010, and/or data products created thereof. Pan-STARRS is a project of the Institute for Astronomy of the University of Hawaii, and is supported by the NASA SSO Near Earth Observation Program under grants 80NSSC18K0971, NNX14AM74G, NNX12AR65G, NNX13AQ47G, NNX08AR22G, 80NSSC21K1572 and by the State of Hawaii. This work makes use of observations from the Las Cumbres Observatory network. The LCO team is supported by NSF grants AST-2308113 and AST-1911151.
