Forward Modeling of Double Neutron Stars: Insights from Highly Offset Short Gamma-Ray Bursts

被引:16
作者
Zevin, Michael [1 ,2 ,3 ,4 ]
Kelley, Luke Zoltan [1 ,2 ]
Nugent, Anya [1 ,2 ]
Fong, Wen-fai [1 ,2 ]
Berry, Christopher P. L. [1 ,2 ]
Kalogera, Vicky [1 ,2 ]
机构
[1] Northwestern Univ, Dept Phys & Astron, 2145 Sheridan Rd, Evanston, IL 60208 USA
[2] Ctr Interdisciplinary Explorat & Res Astrophys CI, 1800 Sherman Ave, Evanston, IL 60201 USA
[3] Univ Chicago, Enrico Fermi Inst, 5640 South Ellis Ave, Chicago, IL 60637 USA
[4] Univ Chicago, Kavli Inst Cosmol Phys, 5640 South Ellis Ave, Chicago, IL 60637 USA
基金
美国国家科学基金会; 英国科学技术设施理事会;
关键词
Gamma-ray bursts; Supernova dynamics; Neutron stars; Compact binary stars; Stellar evolution; Galaxy evolution; HOST GALAXIES; ILLUSTRIS SIMULATION; SPATIAL-DISTRIBUTION; PSR J0737-3039; CORE-COLLAPSE; PROGENITORS; MASS; CONSTRAINTS; BINARIES; EVOLUTION;
D O I
10.3847/1538-4357/abc266
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 greater than or similar to 200 km s(-1) at the 78% and 91% credible 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.
引用
收藏
页数:13
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