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  A year in the life of GW 170817: the rise and fall of a structured jet from a binary neutron star merger

Troja, E., van Eerten, H., Ryan, G., Ricci, R., Burgess, J. M., Wieringa, M. H., et al. (2019). A year in the life of GW 170817: the rise and fall of a structured jet from a binary neutron star merger. Monthly Notices of the Royal Astronomical Society, 489(2), 1919-1926. doi:10.1093/mnras/stz2248.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4E39-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4E3A-4
Genre: Journal Article

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Troja, E., Author
van Eerten, H., Author
Ryan, G., Author
Ricci, R., Author
Burgess, J. M.1, Author              
Wieringa, M. H., Author
Piro, L., Author
Cenko, S. B., Author
Sakamoto, T., Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present the results of our year-long afterglow monitoring of GW 170817, the first binary neutron star merger detected by Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo. New observations with the Australian Telescope Compact Array and the Chandra X-ray Telescope were used to constrain its late-time behaviour. The broad-band emission, from radio to X-rays, is well-described by a simple power-law spectrum with index β ∼ 0.585 at all epochs. After an initial shallow rise ∝t0.9, the afterglow displayed a smooth turnover, reaching a peak X-ray luminosity of LX ≈ 5 × 1039 erg s−1 at 160 d, and has now entered a phase of rapid decline, approximately ∝t−2. The latest temporal trend challenges most models of choked jet/cocoon systems, and is instead consistent with the emergence of a relativistic structured jet seen at an angle of ≈22° from its axis. Within such model, the properties of the explosion (such as its blast wave energy EK ≈ 2 × 1050 erg, jet width θc ≈ 4°, and ambient density n ≈ 3 × 10−3 cm−3) fit well within the range of properties of cosmological short gamma-ray bursts.

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 Dates: 2019-08-13
 Publication Status: Published online
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2248
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 489 (2) Sequence Number: - Start / End Page: 1919 - 1926 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150