Merging White Dwarfs, Thermonuclear Supernovae, Other Transients

合并白矮星、热核超新星、其他瞬变

基本信息

批准号：
261946-2013
负责人：
vanKerkwijk, Marten
金额：
$ 3.79万
依托单位：
University of Toronto
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2017
资助国家：
加拿大
起止时间：
2017-01-01 至 2018-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633367
关键词：
Merging White Dwarfs Thermonuclear Supernovae

项目摘要

MERGING WHITE DWARFS, THERMONUCLEAR SUPERNOVAE, AND OTHER TRANSIENTSThe merger of two white dwarfs can lead to a spectacular transient -- a thermonuclear supernova or accretion induced collapse to a neutron star -- or the formation of strange objects -- such as the R CrB helium giant stars. We recently realized that mergers of two white dwarfs made of carbon and oxygen might well produce most thermonuclear supernovae, and that this would, contrary to the current paradigm, likely happen independently of whether or not their total mass exceeds the maximum possible, Chandrasekhar mass. My proposal is to develop this new research direction, hoping to answer the following sets of questions:What triggers thermonuclear supernovae? From observations, can we distinguish ignition due to high density in a near-Chandrasekhar object, or due to high temperature in a sub-Chandrasekhar one? Does it happen in a fast merger with another white dwarf, or during slow accretion from a companion?What are the outcomes of white-dwarf mergers? Using simulations, what properties do merger remnants have? What happens as remaining disks accrete and spins evolve? Will some ignite nuclear runaways? Might detonations follow? Would this produce thermonuclear supernovae? What other transients might one expect?What types of transients occur in Nature? Do the multitudes of different transients predicted by theory actually occur? Are there ones we failed to imagine? For supernovae, can we see the shock break out of the star? See ejecta interact with a companion, a disk, or its environment?

合并白色矮人，热核超新星和其他瞬态，两个白色矮人的合并会导致壮观的短暂性 - 热核超新星或积聚引起的崩溃，或形成奇怪的物体 - 例如R CRB氦型巨星恒星。我们最近意识到，由碳和氧气制成的两个白色矮人的合并很可能会产生大多数热核超新星，这与当前的范式相反，可能与当前的范式相反，与其总质量是否超过了最大可能的最大可能性，Chandrasekhar Mass可能会发生。我的建议是开发这个新的研究方向，希望回答以下一组问题：是什么触发了热核超新星？从观察结果来看，我们是否可以区分近chandrasekhar物体中的高密度或由于亚chandrasekhar One中的高温引起的点火？它是在与另一个白矮人的快速合并中，还是在同伴的缓慢积聚期间发生？白矮人合并的结果是什么？使用模拟，合并残留物具有哪些属性？剩下的圆盘会进化，剩下的磁盘会发生什么？会点燃核逃亡吗？爆炸可能随之而来？这会产生热核超新星吗？人们可能会期望其他哪些瞬态？自然界中发生了哪些类型的瞬变？从理论预测的许多不同瞬态是否实际发生？我们没有想象吗？对于超新星，我们可以看到震惊的爆发吗？请参阅Ejecta与同伴，磁盘或其环境相互作用？