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Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows

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arxiv 1912.01871 v3 pith:CQ5V75NL submitted 2019-12-04 astro-ph.HE

Kazuya Takahashi , Kunihito Ioka This is my paper · ORCID
classification astro-ph.HE
keywords structureafterglowsburstdifferentgamma-raymethodobservationsoff-axis
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The gravitational wave event GW170817 and the slowly-rising afterglows of short gamma-ray burst GRB 170817A clearly suggest that the GRB jet has an angular structure. However the actual jet structure remains unclear as different authors give different structures. We formulate a novel method to inversely reconstruct the jet structure from off-axis GRB afterglows, without assuming any functional form of the structure in contrast to the previous studies. The jet structure is uniquely determined from the rising part of a light curve for a given parameter set by integrating an ordinary differential equation, which is derived from the standard theory of GRB afterglows. Applying to GRB 170817A, we discover that a non-trivial hollow-cone jet is consistent with the observed afterglows, as well as Gaussian and power-law jets within errors, which implies the Blandford-Znajek mechanism or an ejecta-jet interaction. The current observations only constrain the jet core, not in principle the outer jet structure around the line of sight. More precise and high-cadence observations with our inversion method will fix the jet structure, providing a clue to the jet formation and propagation.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On the Duration of Gamma-Ray Bursts

    astro-ph.HE 2024-12 conditional novelty 4.0 of 10

    GRB duration is shaped by the progenitor, the central engine, the emitter, and geometry, so short versus long duration is not a reliable direct indicator of what exploded or merged.

  2. Gamma-ray bursts: what do we know today that we did not know 10 years ago?

    astro-ph.HE 2024-12 unverdicted

    A review of the past decade of gamma-ray burst research, highlighting structured jets, GR-MHD simulations, TeV detections, and the contested idea that many GRBs have moderate Lorentz factors.

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