Forward Modeling of Double Neutron Stars: Insights from Highly Offset Short Gamma-Ray Bursts
Forward Modeling of Double Neutron Stars: Insights from Highly Offset Short Gamma-Ray Bursts
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DOI：
10.3847/1538-4357/abc266
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
M. Zevin;L. Kelley;A. Nugent;W. Fong;C. Berry;V. Kalogera
中科院分区：
文献类型：
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作者：
M. Zevin;L. Kelley;A. Nugent;W. Fong;C. Berry;V. Kalogera
我们提出了一个详细的分析两个本地化，高度偏移短伽玛射线暴GRB 070809和GRB 090515-调查他们的祖先从紧凑的对象形成，直到合并的运动学演化。校准到他们最可能的宿主星系的观测，我们构建半解析星系模型，占星星形成的历史和星系的增长随着时间的推移。我们对详细的运动学演化与紧凑的二进制人口建模，以推断可行的后超新星速度和螺旋时间。通过填充二进制示踪剂根据主机的星星形成的历史和运动学发展的超新星后的轨迹通过随时间变化的银河系的潜力，我们发现，系统相匹配的观测到的偏移量的爆发需要后超新星的系统速度每秒数百公里。边缘化的恒星质量晕质量关系的不确定性，我们发现，第二个出生的中子星星在GRB 070809和GRB 090515祖系统收到了纳塔尔踢在和可信的水平，分别。将我们的分析应用于局部短伽马射线暴的完整目录将提供对其祖先的独特约束，并有助于解开观察相对于其宿主高度偏移的瞬变所固有的选择效应。
We present a detailed analysis of two well-localized, highly offset short gamma-ray bursts—GRB 070809 and GRB 090515—investigating the kinematic evolution of their progenitors from compact object formation until merger. Calibrating to observations of their most probable host galaxies, we construct semi-analytic galactic models that account for star formation history and galaxy growth over time. We pair detailed kinematic evolution with compact binary population modeling to infer viable post-supernova velocities and inspiral times. By populating binary tracers according to the star formation history of the host and kinematically evolving their post-supernova trajectories through the time-dependent galactic potential, we find that systems matching the observed offsets of the bursts require post-supernova systemic velocities of hundreds of kilometers per second. Marginalizing over uncertainties in the stellar mass–halo mass relation, we find that the second-born neutron star in the GRB 070809 and GRB 090515 progenitor systems received a natal kick of at the and credible levels, respectively. Applying our analysis to the full catalog of localized short gamma-ray bursts will provide unique constraints on their progenitors and help unravel the selection effects inherent to observing transients that are highly offset with respect to their hosts.