Nested, asymmetric H-He circumstellar shells in the Type Icn/Ibn SN 2024abvb
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | The INTEL Collaboration Anderson, J. P. Aster, C. Bulla, M. Chen, T. -W. Fraser, M. Galbany, L. Gutiérrez, C. P. Inserra, C. Killestein, T. Leloudas, G. Lyman, J. D. Maeda, K. Maguire, K. Mason, E. Moriya, T. Pastorello, A. Taubenberger, S. Pursiainen, M. Wichern, H. |
| author_facet | The INTEL Collaboration Anderson, J. P. Aster, C. Bulla, M. Chen, T. -W. Fraser, M. Galbany, L. Gutiérrez, C. P. Inserra, C. Killestein, T. Leloudas, G. Lyman, J. D. Maeda, K. Maguire, K. Mason, E. Moriya, T. Pastorello, A. Taubenberger, S. Pursiainen, M. Wichern, H. |
| contents | Interacting transients probe mass loss in the final stages of stellar evolution; however, the geometry and timing of multi-episode mass loss remain poorly constrained. SN 2024abvb is a nearby interacting event with transitional Ibn/Icn spectroscopic properties and multi-epoch polarimetry, offering a rare opportunity to study structured circumstellar material (CSM). We aim to characterise the kinematics, composition and geometry of the CSM around SN 2024abvb and to identify plausible progenitor/ejection scenarios that can produce the observed spectro-polarimetric evolution. We present high-resolution (VLT/UVES and VLT/X-Shooter) optical/NIR spectroscopy across several epochs, complemented by broadband polarimetry and spectropolarimetry (VLT/FORS2 and NOT/ALFOSC). Line identifications, velocity decompositions and polarimetric time-series are used to trace multiple kinematic components and changes in scattering geometry. The high-resolution spectra reveal multiple narrow CSM components composed of He, C and O with absorption minima at $\sim150 - 400$ km s$^{-1}$ and additional faster material up to $\sim2000$ \kms. Low-velocity Balmer absorptions are present, indicating distant H-rich material, a first in SNe Ibn/Icn. Polarimetry shows a marked evolution ($P\sim1\%$ near peak, $\lesssim0.5\%$ after $\sim1$ week, rising to $\sim1.5\%$ at $\sim20$ d with $\sim50^\circ$ position-angle rotation and to $\sim4\%$ at $\sim30$ d, stronger in the blue), implying a time-variable, wavelength-dependent scattering/obscuration component. The combination of kinematics and polarimetric behaviour is consistent with multiple, concentric toroidal shells with differing orientations and partial dust content. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_00389 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nested, asymmetric H-He circumstellar shells in the Type Icn/Ibn SN 2024abvb The INTEL Collaboration Anderson, J. P. Aster, C. Bulla, M. Chen, T. -W. Fraser, M. Galbany, L. Gutiérrez, C. P. Inserra, C. Killestein, T. Leloudas, G. Lyman, J. D. Maeda, K. Maguire, K. Mason, E. Moriya, T. Pastorello, A. Taubenberger, S. Pursiainen, M. Wichern, H. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Interacting transients probe mass loss in the final stages of stellar evolution; however, the geometry and timing of multi-episode mass loss remain poorly constrained. SN 2024abvb is a nearby interacting event with transitional Ibn/Icn spectroscopic properties and multi-epoch polarimetry, offering a rare opportunity to study structured circumstellar material (CSM). We aim to characterise the kinematics, composition and geometry of the CSM around SN 2024abvb and to identify plausible progenitor/ejection scenarios that can produce the observed spectro-polarimetric evolution. We present high-resolution (VLT/UVES and VLT/X-Shooter) optical/NIR spectroscopy across several epochs, complemented by broadband polarimetry and spectropolarimetry (VLT/FORS2 and NOT/ALFOSC). Line identifications, velocity decompositions and polarimetric time-series are used to trace multiple kinematic components and changes in scattering geometry. The high-resolution spectra reveal multiple narrow CSM components composed of He, C and O with absorption minima at $\sim150 - 400$ km s$^{-1}$ and additional faster material up to $\sim2000$ \kms. Low-velocity Balmer absorptions are present, indicating distant H-rich material, a first in SNe Ibn/Icn. Polarimetry shows a marked evolution ($P\sim1\%$ near peak, $\lesssim0.5\%$ after $\sim1$ week, rising to $\sim1.5\%$ at $\sim20$ d with $\sim50^\circ$ position-angle rotation and to $\sim4\%$ at $\sim30$ d, stronger in the blue), implying a time-variable, wavelength-dependent scattering/obscuration component. The combination of kinematics and polarimetric behaviour is consistent with multiple, concentric toroidal shells with differing orientations and partial dust content. |
| title | Nested, asymmetric H-He circumstellar shells in the Type Icn/Ibn SN 2024abvb |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2602.00389 |