Zevin, M., Kelley, L. Z., Nugent, A., Fong, W.-f., Berry, C. P.L. and Kalogera, V. (2020) Forward modeling of double neutron stars: insights from highly offset short gamma-ray bursts. Astrophysical Journal, 904(2), 190. (doi: 10.3847/1538-4357/abc266)
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Abstract
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 ~>200 km s-1 at the 78% and 91% 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | No |
| Glasgow Author(s) Enlighten ID: | Berry, Dr Christopher |
| Authors: | Zevin, M., Kelley, L. Z., Nugent, A., Fong, W.-f., Berry, C. P.L., and Kalogera, V. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Astrophysical Journal |
| Publisher: | IOP Publishing |
| ISSN: | 0004-637X |
| ISSN (Online): | 1538-4357 |
| Published Online: | 04 December 2020 |
| Copyright Holders: | Copyright © 2020 The American Astronomical Society |
| First Published: | First published in Astrophysical Journal 904(2): 190 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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