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arXiv 2102.05649astro-ph.HE
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LIGO/Virgo源形成的共同包层发展标准的影响

The impact of common envelope development criteria on the formation of LIGO/Virgo sources

Aleksandra Olejak, Krzysztof Belczynski, Natalia Ivanova

摘要:

不稳定罗氏瓣溢出(RLOF)的治疗和标准的发展,导致共同的信封(CE)阶段已经阻碍了几十年的进化预测。特别是在经典孤立双星演化模型中,黑洞-黑洞(BH-BH)、黑洞-中子星(BH-NS)和中子星-中子星(NS-NS)并合双星的形成对CE相有很强的依赖性。所有这些合并现在都被报告为LIGO/Virgo源或源候选者。CE甚至被一些人认为是形成BH-BH,BH-NS或NS-NS合并的强制性阶段。目前,还没有一个完整的第一性原理模型的发展CE。我们采用Startrack人口合成代码来测试目前在大量供体的RLOF稳定性研究方面的进展,以评估它们对LIGO/Virgo源人口的影响。特别是,我们允许更严格的CE开发标准的大规模捐助者。我们还测试了不同类型的稳定的传质之间切换的修改后的条件。实现的修改显着影响合并双紧凑对象的基本属性,有时以非直观的方式。对于一个受限制的CE发展标准的测试模型,当地的合并率密度BH-BH系统的增加,由于出现了一个新的主导形成的情况下,没有任何CE阶段。我们发现,在RLOF物理高度不确定的假设的变化可能会显着影响(i)本地合并率密度,(ii)的质量和质量比分布的形状,和(iii)占主导地位的演变形成(有和没有CE)的LIGO/Virgo源的场景。我们的研究结果表明,没有足够强的约束RLOF物理,是不能够得出完全可靠的结论,人口的双紧凑对象系统的基础上人口合成研究。

英文摘要:

The treatment and criteria for development of unstable Roche lobe overflow (RLOF) that leads to the common envelope (CE) phase have hindered the evolutionary predictions for decades. In particular, the formation of black hole-black hole (BH-BH), black hole-neutron star (BH-NS), and neutron star-neutron star (NS-NS) merging binaries depends sensitively on the CE phase in classical isolated binary evolution model. All these mergers are now reported as LIGO/Virgo sources or source candidates. CE is even considered by some as a mandatory phase in the formation of BH-BH, BH-NS or NS-NS mergers in binary evolution. At the moment, there is no full first-principles model for development of CE. We employ the Startrack population synthesis code to test the current advancements in studies on stability of RLOF for massive donors to assess their effect on LIGO/Virgo source population. In particular, we allow for more restrictive CE development criteria for massive donors. We also test a modified condition for switching between different types of stable mass transfer. Implemented modifications significantly influence basic properties of merging double compact objects, sometimes in non-intuitive way. For one of tested models with restricted CE development criteria local merger rate density for BH-BH systems increased due to emergence of a new dominant formation scenario without any CE phase. We find that the changes in highly uncertain assumptions on RLOF physics may significantly affect (i) local merger rate density, (ii) shape of the mass and mass ratio distributions, and (iii) dominant evolutionary formation (with and without CE) scenarios of LIGO/Virgo sources. Our results demonstrate that without sufficiently strong constraints on RLOF physics, one is not able to draw fully reliable conclusions about the population of double compact object systems based on population synthesis studies.

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