EM counterparts of structured jets from 3D GRMHD simulations

Adithan Kathirgamaraju*, Alexander Tchekhovskoy, Dimitrios Giannios, Rodolfo Barniol Duran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


GW170817/GRB170817A has offered unprecedented insight into binary neutron star post merger systems. Its Prompt and afterglow emission imply the presence of a tightly collimated relativistic jet with a smooth transverse structure. However, it remains unclear whether and how the central engine can produce such structured jets. Here, we utilize 3D general relativistic magneto hydrodynamic simulations starting with a black hole surrounded by a magnetized torus with properties typically expected of a post-merger system. We follow the jet, as it is self-consistently launched, from the scale of the compact object out to more than three orders of magnitude in distance. We find that this naturally results in a structured jet, which is collimated by the disc wind into a half-opening angle of roughly 10°; its emission can explain features of both the prompt and afterglow emission of GRB170817A for a 30° observing angle. Our work is the first to compute the afterglow, in the context of a binary merger, from a relativistic magnetized jet self-consistently generated by an accreting black hole, with the jet's transverse structure determined by the accretion physics and not prescribed at any point.

Original languageEnglish (US)
Pages (from-to)L98-L103
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
StatePublished - Mar 21 2019


  • MHD
  • gamma-ray burst: individual:170817A
  • methods: numerical
  • radiation mechanisms: non-thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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