The Transformation of SN1987A into a Supernova Remnant

SN1987A 转变为超新星遗迹

• 批准号: 0206048
• 负责人: Arlin P. Crotts
• 金额: $ 20.81万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206048&HistoricalAwards=false
• 关键词: Transformation; SN1987A; into; Supernova; Remnant

AST-0206048CrottsSupernova 1987A, the closest SN seen in nearly four centuries, and the most intenselystudied ever, is rapidly turning into a SN remnant as the ejecta from the explosion nowstrikes the circumstellar envelope shed by the star over the last million years. We proposeto observe this process using a combination of optical, IR and UV programs, plus furtherspace-based studies (supported by NASA). These will allow us to map the structure ofthe envelope, both in its unperturbed state and as it is destroyed by the ejecta. Thiswill allow the first complete study of SN remnant formation evolution ever undertaken.Our previous observations of the 3-D structure, velocities, density and composition willestablish the nature of the pre-explosion nebula and the mass loss processes that created it,while the excitation of this nebula by the X and EUV flux created in the collision will allowus to re-analyze it once more. In addition to these unprecedented studies of a SN remnant,will continue to use light echoes from the SN explosion to explore the interstellarmedium in the 30 Doradus star-formation region, to study the echo of the UV pulse fromSN shock breakout through the progenitor star's surface, and to accurately determine thedistance to the Large Magellanic Cloud { a fundamental rung on the extragalactic distanceladder.***

AST-0206048 CrottsSupernova 1987A是近四个世纪以来最接近的SN，也是有史以来研究最深入的超新星，随着爆炸喷出的物质撞击到这颗恒星在过去100万年里脱落的星周包层，它正在迅速变成SN残留物。我们建议使用光学、红外和紫外线计划的组合，以及进一步的太空研究(由NASA支持)来观察这一过程。这将使我们能够绘制出信封的结构图，无论是在其未受干扰的状态下，还是在它被喷出物摧毁的时候。这将是有史以来第一次对SN残骸形成演化进行完整的研究。我们之前对3D结构、速度、密度和组成的观测将确立爆炸前星云的性质和产生它的质量损失过程，而碰撞中产生的X和EUV通量对该星云的激发将使我们能够再次对其进行重新分析。除了这些史无前例的SN残余物研究外，还将继续利用SN爆炸的光回波来探索剑鱼座30恒星形成区的星际介质，研究SN冲击爆发通过前驱恒星表面的UV脉冲的回声，并准确地确定到大麦哲伦星云的距离(河外距离阶梯上的一个基本梯级)。