Electromagnetic transients from radioactive decays accompanying short gamma-ray bursts

伴随短伽马射线暴的放射性衰变产生的电磁瞬变

• 批准号: 194671666
• 负责人: Professor Dr. Stephan Rosswog
• 金额: --
• 依托单位: Institutionen för astronomi
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/194671666?language=en
• 关键词: Electromagnetic; transients; radioactive; decays; accompanying

The final inspiral stages and the subsequent coalescence of two neutron stars or of a neutron star and a stellar-mass black hole are the prime gravitational wave sources in the kilohertz regime. Moreover, they are thought to be the "central engines" behind the (short) Gamma-ray burst phenomenon. During the merging process, gravitational torques launch decompressed neutron star matter into unbound or nearly unbound, eccentric orbits. This debris consists of radioactive nuclei that finally decay into so-called r-process ("rapid neutron capture") elements and this decay must produce an isotropic, bright, but rapidly decaying electromagnetic transient. The identification of such transients is crucial since it increases the effective sensitivity of ground-based gravitational wave detector facilities and it places compact binary mergers in an astrophysical context by providing information on the host galaxy, the local environment and on binary star properties and evolution. Thus, current and future transient surveys can constrain the still unknown origin of the heaviest elements in the Universe. The aim of this proposal is to overcome the latter restriction and to perform a complete calculation from the initial merger process over the evolution of the debris material (including feedback from nuclear energy release onto the hydrodynamics) to the final light curves.

最后的激发阶段和随后的两颗中子星或一颗中子星和一个恒星质量黑洞的合并是千赫兹范围内的主要引力波源。此外，它们被认为是（短暂的）伽马射线暴现象背后的“中央引擎”。在合并过程中，引力扭矩将解压的中子星物质发射到未绑定或几乎未绑定的偏心轨道上。这些碎片由放射性原子核组成，最终衰变为所谓的r过程（“快中子捕获”）元素，这种衰变必须产生各向同性、明亮但快速衰减的电磁瞬变。这种瞬变的识别是至关重要的，因为它增加了地面引力波探测器设施的有效灵敏度，并通过提供有关宿主星系、当地环境以及双星特性和演化的信息，将紧凑的双星合并置于天体物理背景下。因此，当前和未来的瞬态观测可以限制宇宙中最重元素的未知起源。本提案的目的是克服后一种限制，并执行一个完整的计算，从最初的合并过程到碎片材料的演变（包括从核能释放到流体动力学的反馈）到最终的光曲线。

项目成果

The electromagnetic signals of compact binary mergers

• DOI: 10.1093/mnras/stt037
• 发表时间: 2013-04-01
• 期刊: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
• 影响因子: 4.8
• 作者: Piran, Tsvi;Nakar, Ehud;Rosswog, Stephan
• 通讯作者: Rosswog, Stephan

On the astrophysical robustness of the neutron star merger r-process

• DOI: 10.1111/j.1365-2966.2012.21859.x
• 发表时间: 2012-11-01
• 期刊: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
• 影响因子: 4.8
• 作者: Korobkin, O.;Rosswog, S.;Winteler, C.
• 通讯作者: Winteler, C.

The long-term evolution of neutron star merger remnants – I. The impact of r-process nucleosynthesis

• DOI: 10.1093/mnras/stt2502
• 发表时间: 2013-07
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: S. Rosswog;O. Korobkin;A. Arcones;F. Thielemann;T. University;Okc;I. Darmstadt;U. Basel;R. I. O. Physics

Neutrino-driven winds from neutron star merger remnants

• DOI: 10.1093/mnras/stu1352
• 发表时间: 2014-05
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: A. Perego;S. Rosswog;R. Cabezón;O. Korobkin;R. Kaeppeli;A. Arcones;M. Liebendoerfer

The multimessenger picture of compact object encounters: binary mergers versus dynamical collisions

• DOI: 10.1093/mnras/sts708
• 发表时间: 2012-04
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: S. Rosswog;S. Rosswog;S. Rosswog;T. Piran;E. Nakar