The radio re-brightening of the Type IIb SN 2001ig
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915306894524416 |
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| author | Soria, Roberto Russell, Thomas D. Wiston, Eli Cheng, Siying Margutti, Raffaella Rose, Kovi Ryder, Stuart Terreran, Giacomo |
| author_facet | Soria, Roberto Russell, Thomas D. Wiston, Eli Cheng, Siying Margutti, Raffaella Rose, Kovi Ryder, Stuart Terreran, Giacomo |
| contents | We study the late-time evolution of the compact Type IIb SN 2001ig in the spiral galaxy NGC 7424, with new and unpublished archival data from the Australia Telescope Compact Array and the Australian Square Kilometre Array Pathfinder. More than two decades after the SN explosion, its radio luminosity is showing a substantial re-brightening: it is now two orders of magnitude brighter than expected from the standard model of a shock expanding into a uniform circumstellar wind (i.e., with a density scaling as R^{-2}). This suggests that the SN ejecta have reached a denser shell, perhaps compressed by the fast wind of the Wolf-Rayet progenitor or expelled centuries before the final stellar collapse. We model the system parameters (circumstellar density profile, shock velocity, mass loss rate), finding that the denser layer was encountered when the shock reached a distance of ~0.1 pc; the mass-loss rate of the progenitor immediately before the explosion was Mdot/v_w ~ 10^{-7} Msun/yr/(km/s). We compare SN 2001ig with other SNe that have shown late-time re-brightenings, and highlight the opposite behaviour of some extended Type IIb SNe which show instead a late-time flux cut-off. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_01740 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The radio re-brightening of the Type IIb SN 2001ig Soria, Roberto Russell, Thomas D. Wiston, Eli Cheng, Siying Margutti, Raffaella Rose, Kovi Ryder, Stuart Terreran, Giacomo High Energy Astrophysical Phenomena Astrophysics of Galaxies We study the late-time evolution of the compact Type IIb SN 2001ig in the spiral galaxy NGC 7424, with new and unpublished archival data from the Australia Telescope Compact Array and the Australian Square Kilometre Array Pathfinder. More than two decades after the SN explosion, its radio luminosity is showing a substantial re-brightening: it is now two orders of magnitude brighter than expected from the standard model of a shock expanding into a uniform circumstellar wind (i.e., with a density scaling as R^{-2}). This suggests that the SN ejecta have reached a denser shell, perhaps compressed by the fast wind of the Wolf-Rayet progenitor or expelled centuries before the final stellar collapse. We model the system parameters (circumstellar density profile, shock velocity, mass loss rate), finding that the denser layer was encountered when the shock reached a distance of ~0.1 pc; the mass-loss rate of the progenitor immediately before the explosion was Mdot/v_w ~ 10^{-7} Msun/yr/(km/s). We compare SN 2001ig with other SNe that have shown late-time re-brightenings, and highlight the opposite behaviour of some extended Type IIb SNe which show instead a late-time flux cut-off. |
| title | The radio re-brightening of the Type IIb SN 2001ig |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.01740 |