What determines the structure of short gamma-ray burst jets?
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What determines the structure of short gamma-ray burst jets? / Urrutia, Gerardo; De Colle, Fabio; Murguia-Berthier, Ariadna; Ramirez-Ruiz, Enrico.
I: Monthly Notices of the Royal Astronomical Society, Bind 503, Nr. 3, 05.2021, s. 4363-4371.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - What determines the structure of short gamma-ray burst jets?
AU - Urrutia, Gerardo
AU - De Colle, Fabio
AU - Murguia-Berthier, Ariadna
AU - Ramirez-Ruiz, Enrico
PY - 2021/5
Y1 - 2021/5
N2 - The discovery of GRB 170817A, the first unambiguous off-axis short gamma-ray burst (sGRB) arising from a neutron star merger, has challenged our understanding of the angular structure of relativistic jets. Studies of the jet propagation usually assume that the jet is ejected from the central engine with a top-hat structure and its final structure, which determines the observed light curve and spectra, is primarily regulated by the interaction with the nearby environment. However, jets are expected to be produced with a structure that is more complex than a simple top-hat, as shown by global accretion simulations. We present numerical simulations of sGRBs launched with a wide range of initial structures, durations, and luminosities. We follow the jet interaction with the merger remnant wind and compute its final structure at distances greater than or similar to 10(11) cm from the central engine. We show that the final jet structure, as well as the resulting afterglow emission, depends strongly on the initial structure of the jet, its luminosity, and duration. While the initial structure of the jet is preserved for long-lasting sGRBs, it is strongly modified for jets barely making their way through the wind. This illustrates the importance of combining the results of global simulations with propagation studies in order to better predict the expected afterglow signatures from neutron star mergers. Structured jets provide a reasonable description of the GRB 170817A afterglow emission with an off-axis angle theta(obs) approximate to 22.5 degrees.
AB - The discovery of GRB 170817A, the first unambiguous off-axis short gamma-ray burst (sGRB) arising from a neutron star merger, has challenged our understanding of the angular structure of relativistic jets. Studies of the jet propagation usually assume that the jet is ejected from the central engine with a top-hat structure and its final structure, which determines the observed light curve and spectra, is primarily regulated by the interaction with the nearby environment. However, jets are expected to be produced with a structure that is more complex than a simple top-hat, as shown by global accretion simulations. We present numerical simulations of sGRBs launched with a wide range of initial structures, durations, and luminosities. We follow the jet interaction with the merger remnant wind and compute its final structure at distances greater than or similar to 10(11) cm from the central engine. We show that the final jet structure, as well as the resulting afterglow emission, depends strongly on the initial structure of the jet, its luminosity, and duration. While the initial structure of the jet is preserved for long-lasting sGRBs, it is strongly modified for jets barely making their way through the wind. This illustrates the importance of combining the results of global simulations with propagation studies in order to better predict the expected afterglow signatures from neutron star mergers. Structured jets provide a reasonable description of the GRB 170817A afterglow emission with an off-axis angle theta(obs) approximate to 22.5 degrees.
KW - radiation mechanisms: non-thermal
KW - relativistic processes
KW - methods: numerical
KW - gamma-ray burst: general
KW - stars: jets
KW - ADAPTIVE MESH REFINEMENT
KW - COMPACT OBJECT MERGERS
KW - MERGING NEUTRON-STARS
KW - NUMERICAL SIMULATIONS
KW - DYNAMICS
KW - AFTERGLOW
KW - DIVERSITY
KW - RADIATION
KW - OUTFLOWS
KW - RADIO
U2 - 10.1093/mnras/stab723
DO - 10.1093/mnras/stab723
M3 - Journal article
VL - 503
SP - 4363
EP - 4371
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 271822414