Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission
While the environment around Tycho's supernova remnant has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock, which poses a major challenge to this picture. R. Kobashi et al. showed that the existenc...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9d3b |
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| author | Ryosuke Kobashi Shiu-Hang Lee Takaaki Tanaka Keiichi Maeda |
| author_facet | Ryosuke Kobashi Shiu-Hang Lee Takaaki Tanaka Keiichi Maeda |
| author_sort | Ryosuke Kobashi |
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| description | While the environment around Tycho's supernova remnant has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock, which poses a major challenge to this picture. R. Kobashi et al. showed that the existence of dense molecular cloud (MC) surrounding a rarefied wind-like circumstellar matter (CSM) can explain this observational finding in terms of the shock-expansion dynamics, supporting the so-called single-degenerate scenario for the progenitor system. We here extend this work to study the nonthermal emission processes and investigate whether such an environment is consistent with the observed multiwavelength spectrum. While the simulated broadband spectrum based on the wind–MC environment is largely consistent with observations, we find that such an environment predicts a harder gamma-ray spectrum than observed due to the relatively low CSM density in the cavity interior of the MC. This difference can be at least partially attributed to the present 1D setup of the model, which does not account for the clumpy and multidimensional structure of the CSM. Our model provides predictions for the long-term evolution of the broadband spectrum, which can be used to further probe Tycho's surrounding environment in the future, a key to resolving the long-standing issue of Type Ia supernova progenitor channels. |
| format | Article |
| id | doaj-art-d062e226a3a2498b9bfef46f5af91e44 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-d062e226a3a2498b9bfef46f5af91e442025-01-20T06:35:58ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0197918110.3847/1538-4357/ad9d3bExploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal EmissionRyosuke Kobashi0https://orcid.org/0009-0008-4215-1049Shiu-Hang Lee1https://orcid.org/0000-0002-2899-4241Takaaki Tanaka2https://orcid.org/0000-0002-4383-0368Keiichi Maeda3https://orcid.org/0000-0003-2611-7269Department of Astronomy, Kyoto University , Kitashirakawa, Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan ; kobashi@kusastro.kyoto-u.ac.jpDepartment of Astronomy, Kyoto University , Kitashirakawa, Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan ; kobashi@kusastro.kyoto-u.ac.jp; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo , Kashiwa 277-8583, JapanDepartment of Physics, Konan University , 8-9-1 Okamoto, Higashinada, Kobe, Hyogo 658-8501, JapanDepartment of Astronomy, Kyoto University , Kitashirakawa, Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan ; kobashi@kusastro.kyoto-u.ac.jpWhile the environment around Tycho's supernova remnant has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock, which poses a major challenge to this picture. R. Kobashi et al. showed that the existence of dense molecular cloud (MC) surrounding a rarefied wind-like circumstellar matter (CSM) can explain this observational finding in terms of the shock-expansion dynamics, supporting the so-called single-degenerate scenario for the progenitor system. We here extend this work to study the nonthermal emission processes and investigate whether such an environment is consistent with the observed multiwavelength spectrum. While the simulated broadband spectrum based on the wind–MC environment is largely consistent with observations, we find that such an environment predicts a harder gamma-ray spectrum than observed due to the relatively low CSM density in the cavity interior of the MC. This difference can be at least partially attributed to the present 1D setup of the model, which does not account for the clumpy and multidimensional structure of the CSM. Our model provides predictions for the long-term evolution of the broadband spectrum, which can be used to further probe Tycho's surrounding environment in the future, a key to resolving the long-standing issue of Type Ia supernova progenitor channels.https://doi.org/10.3847/1538-4357/ad9d3bMolecular cloudsNon-thermal radiation sourcesCircumstellar matterX-ray sourcesSupernova remnantsType Ia supernovae |
| spellingShingle | Ryosuke Kobashi Shiu-Hang Lee Takaaki Tanaka Keiichi Maeda Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission The Astrophysical Journal Molecular clouds Non-thermal radiation sources Circumstellar matter X-ray sources Supernova remnants Type Ia supernovae |
| title | Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission |
| title_full | Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission |
| title_fullStr | Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission |
| title_full_unstemmed | Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission |
| title_short | Exploring the Circumstellar Environment of Tycho’s Supernova Remnant. II. Impact on the Broadband Nonthermal Emission |
| title_sort | exploring the circumstellar environment of tycho s supernova remnant ii impact on the broadband nonthermal emission |
| topic | Molecular clouds Non-thermal radiation sources Circumstellar matter X-ray sources Supernova remnants Type Ia supernovae |
| url | https://doi.org/10.3847/1538-4357/ad9d3b |
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