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Spectroscopic observations of progenitor activity 100 days before a Type Ibn supernova
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-1325-6235
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-1546-6615
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics. Weizmann Institute of Science, Israel.ORCID iD: 0000-0001-6797-1889
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Number of Authors: 332024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 684, article id L18Article in journal (Refereed) Published
Abstract [en]

Obtaining spectroscopic observations of the progenitors of core-collapse supernovae is often unfeasible, due to an inherent lack of knowledge as to what stars experience supernovae and when they will explode. In this Letter we present photometric and spectroscopic observations of the progenitor activity of SN 2023fyq before the He-rich progenitor explodes as a Type Ibn supernova. The progenitor of SN 2023fyq shows an exponential rise in flux prior to core collapse. Complex He I emission line features are observed in the progenitor spectra, with a P Cygni-like profile, as well as an evolving broad base with velocities of the order of 10 000 km s−1. The luminosity and evolution of SN 2023fyq is consistent with a Type Ibn, reaching a peak r-band magnitude of −18.8 mag, although there is some uncertainty regarding the distance to the host, NGC 4388, which is located in the Virgo cluster. We present additional evidence of asymmetric He-rich material being present both prior to and after the explosion of SN 2023fyq, which suggests that this material survived the ejecta interaction. Broad [O I], C I, and the Ca II triplet lines are observed at late phases, confirming that SN 2023fyq was a genuine supernova, rather than a non-terminal interacting transient. SN 2023fyq provides insight into the final moments of a massive star’s life, demonstrating that the progenitor is likely highly unstable before core collapse.

Place, publisher, year, edition, pages
2024. Vol. 684, article id L18
Keywords [en]
circumstellar matter, supernovae: general, supernovae: individual: ZTF22abzzvln
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-229038DOI: 10.1051/0004-6361/202449350ISI: 001203444100006Scopus ID: 2-s2.0-85190886373OAI: oai:DiVA.org:su-229038DiVA, id: diva2:1859523
Available from: 2024-05-22 Created: 2024-05-22 Last updated: 2024-05-22Bibliographically approved

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Brennan, Seán J.Sollerman, JesperSchulze, SteveFransson, ClaesGkini, AnamariaLunnan, Ragnhild

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Brennan, Seán J.Sollerman, JesperSchulze, SteveChen, P.Fransson, ClaesGkini, AnamariaLunnan, Ragnhild
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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