2018/01/31 by E. Troja, L. Piro, Geoffrey Ryan +9
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Broad band #Gamma-ray bursts and supernovae #Meteorology #Outflow #Physics #Pulsars and Gravitational Waves Research #astro-ph.HE
paper · pdf · doi:10.1093/mnrasl/sly061
6 pages, 4 figures, accepted by MNRAS Letters. Minor changes to match the accepted version
openalex publication_date 2018/04/11 · arxiv created 2018/05/03 · arxiv updated 2018/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.