The outflow structure of GW170817 from late-time broad-band observations
Date Issued
2018
Author(s)
Troja, E.
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•
Ryan, G.
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van Eerten, H.
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•
Wieringa, M. H.
•
•
Sakamoto, T.
•
Cenko, S. B.
Abstract
We present our broad-band study of GW170817 from radio to hard X-rays, including NuSTAR and Chandra observations up to 165 d after the merger, and a multimessenger analysis including LIGO constraints. The data are compared with predictions from a wide range of models, providing the first detailed comparison between non-trivial cocoon and jet models. Homogeneous and power-law shaped jets, as well as simple cocoon models are ruled out by the data, while both a Gaussian shaped jet and a cocoon with energy injection can describe the current data set for a reasonable range of physical parameters, consistent with the typical values derived from short GRB afterglows. We propose that these models can be unambiguously discriminated by future observations measuring the post-peak behaviour, with Fν ∝ t∼-1.0 for the cocoon and Fν∝ t∼-2.5 for the jet model.
Volume
478
Issue
1
Start page
L18
Issn Identifier
1745-3925
Ads BibCode
2018MNRAS.478L..18T
Rights
open.access
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