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タイトル: | Exploring the Circumstellar Environment of Tycho's Supernova Remnant. I. The Hydrodynamic Evolution of the Shock |
著者: | Kobashi, Ryosuke Lee, Shiu-Hang Tanaka, Takaaki Maeda, Keiichi |
著者名の別形: | 小橋, 亮介 李, 兆衡 前田, 啓一 |
キーワード: | Proper motions Molecular clouds Circumstellar matter X-ray sources Supernova remnants Type Ia supernovae |
発行日: | 20-Jan-2024 |
出版者: | American Astronomical Society |
誌名: | The Astrophysical Journal |
巻: | 961 |
号: | 1 |
論文番号: | 32 |
抄録: | Among Type Ia supernova remnants (SNRs), Tycho's SNR has been considered as a typical object from the viewpoints of its spectroscopic, morphological, and environmental properties. A recent reanalysis of Chandra data showed that its forward shock is experiencing a substantial deceleration since around 2007, which suggests recent shock interactions with a dense medium as a consequence of a cavity-wall environment inside a molecular cloud. Such a nonuniform environment can be linked back to the nature and activities of its progenitor. In this study, we perform hydrodynamic simulations to characterize Tycho's cavity-wall environment using the latest multiepoch proper motion measurements of the forward shock. A range of parameters for the environment is explored in the hydrodynamic models to fit with the observational data for each azimuthal region. Our results show that a wind-like cavity with ρ(r) ∝ r⁻² reconciles with the latest data better than a uniform medium with a constant density. In addition, our best-fit model favors an anisotropic wind with an azimuthally varying wind parameter. The overall result indicates a mass-loss rate which is unusually high for the conventional single-degenerate explosion scenario. |
著作権等: | © 2024. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/287228 |
DOI(出版社版): | 10.3847/1538-4357/ad05c2 |
出現コレクション: | 学術雑誌掲載論文等 |
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