A cosmic formation site of silicon and sulphur revealed by a new type of supernova explosion

Abstract

The cores of stars are the cosmic furnaces where light elements are fused into heavier nuclei. The fusion of hydrogen to helium initially powers all stars. The ashes of the fusion reactions are then predicted to serve as fuel in a series of stages, eventually transforming massive stars into a structure of concentric shells. These are composed of natal hydrogen on the outside, and consecutively heavier compositions inside, predicted to be dominated by helium, carbon/oxygen, oxygen/neon/magnesium, and oxygen/silicon/sulphur. Silicon and sulphur are fused into inert iron, leading to the collapse of the core and either a supernova explosion or the direct formation of a black hole. Stripped stars, where the outer hydrogen layer has been removed and the internal He-rich layer (in Wolf-Rayet WN stars) or even the C/O layer below it (in Wolf-Rayet WC/WO stars) are exposed, provide evidence for this shell structure, and the cosmic element production mechanism it reflects. The types of supernova explosions that arise from stripped stars embedded in shells of circumstellar material (most notably Type Ibn supernovae from stars with outer He layers, and Type Icn supernovae from stars with outer C/O layers) confirm this scenario. However, direct evidence for the most interior shells, which are responsible for the production of elements heavier than oxygen, is lacking. Here, we report the discovery of the first-of-its-kind supernova arising from a star peculiarly stripped all the way to the silicon and sulphur-rich internal layer. Whereas the concentric shell structure of massive stars is not under debate, it is the first time that such a thick, massive silicon and sulphur-rich shell, expelled by the progenitor shortly before the SN explosion, has been directly revealed.

48 pages, 12 figures and 10 tables. Submitted to a high-impact journal. The reduced spectra and photometry will be made available via the journal webpage and the WISeREP archive after the acceptance of the paper

References in corpus (49)

• Binary interaction dominates the evolution of massive stars
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Supernova -- Gamma-Ray Burst Connection
• Physical Properties of Wolf-Rayet Stars
• The Zwicky Transient Facility: Science Objectives
• Pulsational Pair-Instability Supernovae
• Pulsational pair instability as an explanation for the most luminous supernovae
• An optical supernova associated with the X-ray flash XRF 060218
• Tidal Disruption Events
• A giant outburst two years before the core-collapse of a massive star
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
• Design and operation of the ATLAS Transient Science Server
• SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
• The Zwicky Transient Facility Bright Transient Survey. II. A Public Statistical Sample for Exploring Supernova Demographics
• The Evolution of Massive Helium Stars Including Mass Loss
• Discovery of the nearby long, soft GRB 100316D with an associated supernova
• Constraints from gravitational wave detections of binary black hole mergers on the ${}^{12}\mathrm{C}{\left(\alpha ,\gamma \right)}^{16}\mathrm{O}$ rate
• The Status of Multi-Dimensional Core-Collapse Supernova Models
• Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
• The Pair-Instability Mass Gap for Black Holes
• A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
• The 2008 Luminous Optical Transient in the Nearby Galaxy NGC 300
• Theory and Diagnostics of Hot Star Mass Loss
• The Zwicky Transient Facility Census of the Local Universe I: Systematic search for Calcium rich gap transients reveal three related spectroscopic sub-classes
• A WC/WO star exploding within an expanding carbon-oxygen-neon nebula
• The Young Supernova Experiment: Survey Goals, Overview, and Operations
• Early-time spectra of supernovae and their precursor winds: the luminous blue variable/yellow hypergiant progenitor of SN 2013cu
• A Search for Extragalactic Fast Blue Optical Transients in ZTF and the Rate of AT2018cow-like Transients
• The prevalence and influence of circumstellar material around hydrogen-rich supernova progenitors
• The Type Icn SN 2021csp: Implications for the Origins of the Fastest Supernovae and the Fates of Wolf-Rayet Stars
• Fast evolving pair-instability supernova models: evolution, explosion, light curves
• ZTF Early Observations of Type Ia Supernovae II: First Light, the Initial Rise, and Time to Reach Maximum Brightness
• Properties of Type Ibn Supernovae: Implications for the Progenitor Evolution and the Origin of a Population of Rapid Transients
• Nebular phase properties of supernova Ibc from He-star explosions
• Pair-Instability Supernova Simulations: Progenitor Evolution, Explosion, and Light Curves
• Optical photometry and spectroscopy of the type Ibn supernova SN 2006jc until the onset of dust formation
• Supernova ejecta interacting with a circumstellar disk. I. two-dimensional radiation-hydrodynamic simulations
• Helium stars exploding in circumstellar material and the origin of Type Ibn supernovae
• Hydrodynamical simulations and similarity relations for eruptive mass loss from massive stars
• The Large Array Survey Telescope -- System Overview and Performances
• The BlackGEM telescope array I: Overview
• An Analytical Density Profile of Dense Circumstellar Medium in Type II Supernovae
• SN 2020bqj: a Type Ibn supernova with a long lasting peak plateau
• Late-time H/He-poor circumstellar interaction in the type-Ic supernova SN 2021ocs: an exposed oxygen-magnesium layer and extreme stripping of the progenitor
• CHIPS: Complete History of Interaction-Powered Supernovae
• Early Ultra-Violet observations of type IIn supernovae constrain the asphericity of their circumstellar material
• Detached and Continuous Circumstellar Matter in Type Ibc Supernovae from Mass Eruption
• Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc

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• The hydrogen-free circumstellar interaction in the Type Ib supernova 2021efd: A clue to the mechanism of the helium-layer stripping
• SN 2024abvb: A Type Icn Supernova in the Outskirts of its Host Galaxy
• Eruptive mass loss less than a year before the explosion of superluminous supernovae. II. A systematic search for pre-explosion eruptions with VLT/X-shooter
• Nested, asymmetric H-He circumstellar shells in the Type Icn/Ibn SN 2024abvb
• Late-time evolution of the interacting stripped-envelope supernova 2017dio
• Spectral Dataset of Stripped-Envelope Supernovae from the Tsinghua Supernova Group