The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions
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| Format: | Preprint |
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2024
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| author | De Looze, Ilse Milisavljevic, Dan Temim, Tea Dickinson, Danielle Fesen, Robert Arendt, Richard G. Chastenet, Jeremy Orlando, Salvatore Vink, Jacco Barlow, Michael J. Kirchschlager, Florian Priestley, Felix D. Raymond, John C. Rho, Jeonghee Sartorio, Nina S. Scheffler, Tassilo Schmidt, Franziska Blair, William P. Fox, Ori Fryer, Christopher Janka, Hans-Thomas Koo, Bon-Chul Laming, J. Martin Matsuura, Mikako Patnaude, Dan Relano, Monica Rest, Armin Schmidt, Judy Smith, Nathan Sravan, Niharika |
| author_facet | De Looze, Ilse Milisavljevic, Dan Temim, Tea Dickinson, Danielle Fesen, Robert Arendt, Richard G. Chastenet, Jeremy Orlando, Salvatore Vink, Jacco Barlow, Michael J. Kirchschlager, Florian Priestley, Felix D. Raymond, John C. Rho, Jeonghee Sartorio, Nina S. Scheffler, Tassilo Schmidt, Franziska Blair, William P. Fox, Ori Fryer, Christopher Janka, Hans-Thomas Koo, Bon-Chul Laming, J. Martin Matsuura, Mikako Patnaude, Dan Relano, Monica Rest, Armin Schmidt, Judy Smith, Nathan Sravan, Niharika |
| contents | JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images - hence dubbed the Green Monster - that stretches across the central parts of the remnant in projection. Combining the kinematic information from NIRSpec and MIRI MRS with the multi-wavelength imaging from NIRCam and MIRI, we associate the Green Monster with circumstellar material that was lost during an asymmetric mass-loss phase. MIRI images are dominated by dust emission but its spectra show emission lines from Ne, H and Fe with low radial velocities indicative of a CSM nature. An X-ray analysis of this feature in a companion paper (Vink et al. 2024) supports its CSM nature and detects significant blue shifting, thereby placing the Green Monster on the near side, in front of the Cas A SN remnant. The most striking features of the Green Monster are dozens of almost perfectly circular 1" - 3" sized holes, most likely created by interaction between high-velocity SN ejecta material and the CSM. Further investigation is needed to understand whether these holes were formed by small 8000-10500 km/s N-rich ejecta knots that penetrated and advanced out ahead of the remnant's 5000 - 6000 km/s outer blastwave, or by narrow ejecta fingers that protrude into the forward-shocked CSM. The detection of the Green Monster provides further evidence of the highly asymmetric mass-loss that Cas A's progenitor star underwent prior to explosion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_05402 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions De Looze, Ilse Milisavljevic, Dan Temim, Tea Dickinson, Danielle Fesen, Robert Arendt, Richard G. Chastenet, Jeremy Orlando, Salvatore Vink, Jacco Barlow, Michael J. Kirchschlager, Florian Priestley, Felix D. Raymond, John C. Rho, Jeonghee Sartorio, Nina S. Scheffler, Tassilo Schmidt, Franziska Blair, William P. Fox, Ori Fryer, Christopher Janka, Hans-Thomas Koo, Bon-Chul Laming, J. Martin Matsuura, Mikako Patnaude, Dan Relano, Monica Rest, Armin Schmidt, Judy Smith, Nathan Sravan, Niharika High Energy Astrophysical Phenomena Solar and Stellar Astrophysics JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images - hence dubbed the Green Monster - that stretches across the central parts of the remnant in projection. Combining the kinematic information from NIRSpec and MIRI MRS with the multi-wavelength imaging from NIRCam and MIRI, we associate the Green Monster with circumstellar material that was lost during an asymmetric mass-loss phase. MIRI images are dominated by dust emission but its spectra show emission lines from Ne, H and Fe with low radial velocities indicative of a CSM nature. An X-ray analysis of this feature in a companion paper (Vink et al. 2024) supports its CSM nature and detects significant blue shifting, thereby placing the Green Monster on the near side, in front of the Cas A SN remnant. The most striking features of the Green Monster are dozens of almost perfectly circular 1" - 3" sized holes, most likely created by interaction between high-velocity SN ejecta material and the CSM. Further investigation is needed to understand whether these holes were formed by small 8000-10500 km/s N-rich ejecta knots that penetrated and advanced out ahead of the remnant's 5000 - 6000 km/s outer blastwave, or by narrow ejecta fingers that protrude into the forward-shocked CSM. The detection of the Green Monster provides further evidence of the highly asymmetric mass-loss that Cas A's progenitor star underwent prior to explosion. |
| title | The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.05402 |