An axisymmetric shock breakout indicated by prompt polarized emission from the type II supernova 2024ggi
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| Format: | Preprint |
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2025
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| author | Yang, Yi Wen, Xudong Wang, Lifan Baade, Dietrich Wheeler, J. Craig Filippenko, Alexei V. Gal-Yam, Avishay Maund, Justyn Schulze, Steve Wang, Xiaofeng Ashall, Chris Bulla, Mattia Cikota, Aleksandar Gao, He Hoeflich, Peter Li, Gaici Mishra, Divya Patat, Ferdinando Patra, Kishore C. Vasylyev, Sergiy S. Yan, Shengyu |
| author_facet | Yang, Yi Wen, Xudong Wang, Lifan Baade, Dietrich Wheeler, J. Craig Filippenko, Alexei V. Gal-Yam, Avishay Maund, Justyn Schulze, Steve Wang, Xiaofeng Ashall, Chris Bulla, Mattia Cikota, Aleksandar Gao, He Hoeflich, Peter Li, Gaici Mishra, Divya Patat, Ferdinando Patra, Kishore C. Vasylyev, Sergiy S. Yan, Shengyu |
| contents | The death of massive stars is triggered by an infall-induced bounce shock that disrupts the star. How such a shock is launched and propagates through the star is a decade-long puzzle. Some models assume that the shock can be reenergized by absorbing neutrinos, leading to highly aspherical explosions. Other models involve jet-powered shocks that lead to bipolar explosions reflected in the geometry of the shock-breakout emission. We report measurement of the geometry of the shock breakout through unprecedentedly early spectropolarimetry of the nearby type II supernova 2024ggi starting ~1.2 days after the explosion. The measurement indicates a well-defined symmetry axis of the shock breakout, which is also shared by the hydrogen-rich envelope that emerged after the circumstellar matter was engulfed by the ejecta, revealing a persisting and prominent symmetry axis throughout the explosion. These findings suggest that the physical mechanism driving the explosion of massive stars manifests a well-defined axial symmetry and acts on large scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08824 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An axisymmetric shock breakout indicated by prompt polarized emission from the type II supernova 2024ggi Yang, Yi Wen, Xudong Wang, Lifan Baade, Dietrich Wheeler, J. Craig Filippenko, Alexei V. Gal-Yam, Avishay Maund, Justyn Schulze, Steve Wang, Xiaofeng Ashall, Chris Bulla, Mattia Cikota, Aleksandar Gao, He Hoeflich, Peter Li, Gaici Mishra, Divya Patat, Ferdinando Patra, Kishore C. Vasylyev, Sergiy S. Yan, Shengyu Solar and Stellar Astrophysics High Energy Astrophysical Phenomena The death of massive stars is triggered by an infall-induced bounce shock that disrupts the star. How such a shock is launched and propagates through the star is a decade-long puzzle. Some models assume that the shock can be reenergized by absorbing neutrinos, leading to highly aspherical explosions. Other models involve jet-powered shocks that lead to bipolar explosions reflected in the geometry of the shock-breakout emission. We report measurement of the geometry of the shock breakout through unprecedentedly early spectropolarimetry of the nearby type II supernova 2024ggi starting ~1.2 days after the explosion. The measurement indicates a well-defined symmetry axis of the shock breakout, which is also shared by the hydrogen-rich envelope that emerged after the circumstellar matter was engulfed by the ejecta, revealing a persisting and prominent symmetry axis throughout the explosion. These findings suggest that the physical mechanism driving the explosion of massive stars manifests a well-defined axial symmetry and acts on large scales. |
| title | An axisymmetric shock breakout indicated by prompt polarized emission from the type II supernova 2024ggi |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.08824 |