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Title: Full transport model of GW170817-like disk produces a blue kilonova

Abstract

The 2017 detection of the inspiral and merger of two neutron stars in gravitational waves and gamma rays was accompanied by a quickly reddening transient. Such a transient was predicted to occur following a rapid neutron capture (r-process) nucleosynthesis event, which synthesizes neutron-rich, radioactive nuclei and can take place in both dynamical ejecta and in the wind driven off the accretion torus formed after a neutron star merger. In this study, we present the first three-dimensional general relativistic, full transport neutrino radiation magnetohydrodynamics simulations of the black hole-accretion disk-wind system produced by the GW170817 merger. We show that the small but non-negligible optical depths lead to neutrino transport globally coupling the disk electron fraction, which we capture by solving the transport equation with a Monte Carlo method. The resulting absorption drives up the electron fraction in a structured, continuous outflow, with electron fraction as high as Y e ~ 0.4 in the extreme polar region. Finally, we show via nuclear reaction network and radiative transfer calculations that nucleosynthesis in the disk wind will produce a blue kilonova.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Princeton Univ., NJ (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1570643
Alternate Identifier(s):
OSTI ID: 1546476
Report Number(s):
LA-UR-19-22623
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
89233218CNA000001; SC0018297; 20170508DR
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 2; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Miller, Jonah Maxwell, Ryan, Benjamin Ransom, Dolence, Joshua C., Burrows, Adam, Fontes, Christopher John, Fryer, Christopher Lee, Korobkin, Oleg, Lippuner, Jonas, Mumpower, Matthew Ryan, and Wollaeger, Ryan Thomas. Full transport model of GW170817-like disk produces a blue kilonova. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.023008.
Miller, Jonah Maxwell, Ryan, Benjamin Ransom, Dolence, Joshua C., Burrows, Adam, Fontes, Christopher John, Fryer, Christopher Lee, Korobkin, Oleg, Lippuner, Jonas, Mumpower, Matthew Ryan, & Wollaeger, Ryan Thomas. Full transport model of GW170817-like disk produces a blue kilonova. United States. doi:10.1103/PhysRevD.100.023008.
Miller, Jonah Maxwell, Ryan, Benjamin Ransom, Dolence, Joshua C., Burrows, Adam, Fontes, Christopher John, Fryer, Christopher Lee, Korobkin, Oleg, Lippuner, Jonas, Mumpower, Matthew Ryan, and Wollaeger, Ryan Thomas. Thu . "Full transport model of GW170817-like disk produces a blue kilonova". United States. doi:10.1103/PhysRevD.100.023008.
@article{osti_1570643,
title = {Full transport model of GW170817-like disk produces a blue kilonova},
author = {Miller, Jonah Maxwell and Ryan, Benjamin Ransom and Dolence, Joshua C. and Burrows, Adam and Fontes, Christopher John and Fryer, Christopher Lee and Korobkin, Oleg and Lippuner, Jonas and Mumpower, Matthew Ryan and Wollaeger, Ryan Thomas},
abstractNote = {The 2017 detection of the inspiral and merger of two neutron stars in gravitational waves and gamma rays was accompanied by a quickly reddening transient. Such a transient was predicted to occur following a rapid neutron capture (r-process) nucleosynthesis event, which synthesizes neutron-rich, radioactive nuclei and can take place in both dynamical ejecta and in the wind driven off the accretion torus formed after a neutron star merger. In this study, we present the first three-dimensional general relativistic, full transport neutrino radiation magnetohydrodynamics simulations of the black hole-accretion disk-wind system produced by the GW170817 merger. We show that the small but non-negligible optical depths lead to neutrino transport globally coupling the disk electron fraction, which we capture by solving the transport equation with a Monte Carlo method. The resulting absorption drives up the electron fraction in a structured, continuous outflow, with electron fraction as high as Ye ~ 0.4 in the extreme polar region. Finally, we show via nuclear reaction network and radiative transfer calculations that nucleosynthesis in the disk wind will produce a blue kilonova.},
doi = {10.1103/PhysRevD.100.023008},
journal = {Physical Review D},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

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