Supernova and Supernova Remnant Studies

超新星和超新星遗迹研究

基本信息

  • 批准号:
    0807727
  • 负责人:
  • 金额:
    $ 25.1万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2008
  • 资助国家:
    美国
  • 起止时间:
    2008-09-01 至 2013-08-31
  • 项目状态:
    已结题

项目摘要

Professor Chevalier and collaborators will undertake four projects that are expected to greatly improve our understanding of the late evolution of massive stars and how/why they end their lives in supernovae. Key to three of these efforts is the study of how supernova ejecta interacts with material shed from stars before the explosion. (1) Type IIn supernovae, with relatively narrow emission lines, represent supernova interaction with up to several solar masses of clumpy circumstellar material that was lost shortly before the explosion. New models for radio and infrared emission, together with inferences from other multiwavelength data, will be combined with hydrodynamic models to better constrain the mass loss, which apparently is episodic, and to place the supernovae in the context of massive star evolution. A revision of the standard view of the final evolution of massive stars may well be required as a result of this work. (2) Type IIP (plateau light curve) supernovae have the highest occurrence rate of core collapse supernovae, but are curiously not well represented among young supernova remnants. The hypothesis that this is due to a low-density surrounding, as expected for stars in the progenitor mass range, will be evaluated through hydrodynamic simulations. The results will be compared to observations of a number of young remnants, including the Crab Nebula. (3) Hydrodynamic models, together with calculations of particle evolution and nonthermal X-ray and radio emission, will be used to set constraints on the mass loss density around normal Type Ia supernovae. The limits are expected to be the strongest for constraining the progenitor system. A fourth project will examine nonradial instability in the late phases of massive star core collapse, which may be a crucial part of the supernova explosion mechanism. A linear analysis of the instability will be used to settle a discrepancy in previous studies and to investigate the physical mechanism for the instability. These projects have broad implications for astrophysics in that they are relevant to the late evolution of massive stars, the return of heavy elements to the interstellar medium, and physical processes at high energy densities. The research will also build and maintain ties between the University of Virginia and Stockholm Observatory. The results will be broadly disseminated at conferences and colloquia. A graduate student and an undergraduate student will be involved in carrying out the research and will learn techniques used in theoretical astrophysics. Finally, the topic of exploding stars is one that captures the public imagination and the research results will be integrated into undergraduate courses and public lectures.
Chevalier教授和合作者将开展四个项目,预计将大大提高我们对大质量恒星后期演化的理解,以及它们如何/为什么在超新星中结束生命。其中三项工作的关键是研究超新星喷出物如何与爆炸前恒星脱落的物质相互作用。(1)IIn型超新星的发射线相对较窄,代表超新星与几个太阳质量的恒星周围物质的相互作用,这些物质在爆炸前不久丢失。新的无线电和红外发射模型,以及从其他多波长数据推断,将与流体动力学模型相结合,以更好地约束质量损失,这显然是偶发性的,并把超新星的背景下,大规模的星星的演变。这项工作的结果可能需要对大质量恒星最终演化的标准观点进行修订。(2)IIP型超新星在核心坍缩超新星中的出现率最高,但奇怪的是在年轻的超新星遗迹中并没有很好的代表。假设这是由于低密度的周围,如预期的恒星在祖质量范围内,将通过流体动力学模拟进行评估。这些结果将与一些年轻遗迹的观测结果进行比较,包括蟹状星云。(3)流体动力学模型,连同粒子演化和非热X射线和无线电发射的计算,将用于设置正常Ia型超新星周围的质量损失密度的约束。预计这些限制对于约束祖系统是最强的。第四个项目将研究大质量星星核心坍缩后期的非径向不稳定性,这可能是超新星爆炸机制的关键部分。不稳定性的线性分析将被用来解决以前的研究中的一个差异,并调查不稳定性的物理机制。这些项目对天体物理学具有广泛的影响,因为它们与大质量恒星的后期演化、重元素返回星际介质以及高能量密度下的物理过程有关。这项研究还将建立和保持弗吉尼亚大学和斯德哥尔摩天文台之间的联系。研究结果将在各种会议和座谈会上广泛传播。一名研究生和一名本科生将参与研究,并将学习理论天体物理学中使用的技术。最后,爆炸恒星的主题是一个捕捉公众的想象力和研究成果将被整合到本科课程和公开讲座。

项目成果

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Roger Chevalier其他文献

Supernova bursts onto the scene
超新星爆发
  • DOI:
    10.1038/453462a
  • 发表时间:
    2008-05-21
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    Roger Chevalier
  • 通讯作者:
    Roger Chevalier
The envelope thickens
信封加厚了。
  • DOI:
    10.1038/339096a0
  • 发表时间:
    1989-05-11
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    Roger Chevalier
  • 通讯作者:
    Roger Chevalier

Roger Chevalier的其他文献

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{{ truncateString('Roger Chevalier', 18)}}的其他基金

Supernova Shock Wave and Radiative Interactions
超新星冲击波和辐射相互作用
  • 批准号:
    1814910
  • 财政年份:
    2018
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Collaborative Research: The Young Remnants of Massive Star Supernovae
合作研究:大质量恒星超新星的年轻遗迹
  • 批准号:
    0307366
  • 财政年份:
    2003
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Standard Grant
Supernovae and Astrophysical Gas Dynamics
超新星和天体物理气体动力学
  • 批准号:
    9314724
  • 财政年份:
    1994
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Supernovae and Astrophysical Gas Dynamics
超新星和天体物理气体动力学
  • 批准号:
    9016687
  • 财政年份:
    1991
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Supernovae and Astrophysical Gas Dynamics
超新星和天体物理气体动力学
  • 批准号:
    8818362
  • 财政年份:
    1989
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Supernovae and Astrophysical Gas Dynamics
超新星和天体物理气体动力学
  • 批准号:
    8615555
  • 财政年份:
    1987
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Supernovae and Astrophysical Gas Dynamics
超新星和天体物理气体动力学
  • 批准号:
    8413138
  • 财政年份:
    1985
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Continuing Grant
Supernovae, Supernova Remnants, and Astrophysical Gas Dynamics
超新星、超新星遗迹和天体物理气体动力学
  • 批准号:
    8019569
  • 财政年份:
    1981
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Standard Grant
Travel to Attend the International Astronomical Union Symposium on Pulsars; Bonn, Germany; August 26-29, 1980
前往参加国际天文学联合会脉冲星研讨会;
  • 批准号:
    8020733
  • 财政年份:
    1980
  • 资助金额:
    $ 25.1万
  • 项目类别:
    Standard Grant

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