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dc.contributor.authorDobie, D.
dc.contributor.authorKaplan, D.
dc.contributor.authorMurphy, T.
dc.contributor.authorLenc, E.
dc.contributor.authorMooley, K.
dc.contributor.authorLynch, Christene
dc.contributor.authorCorsi, A.
dc.contributor.authorFrail, D.
dc.contributor.authorKasliwal, M.
dc.contributor.authorHallinan, G.
dc.identifier.citationDobie, D. and Kaplan, D. and Murphy, T. and Lenc, E. and Mooley, K. and Lynch, C. and Corsi, A. et al. 2018. A Turnover in the Radio Light Curve of GW170817. Astrophysical Journal Letters. 858 (2): Article ID L15.

We present 2-9 GHz radio observations of GW170817 covering the period 125-200 days post-merger, taken with the Australia Telescope Compact Array (ATCA) and the Karl G. Jansky Very Large Array (VLA). Our observations demonstrate that the radio afterglow peaked at 149 ±2 days post-merger and is now declining in flux density. We see no evidence for evolution in the radio-only spectral index, which remains consistent with optically thin synchrotron emission connecting the radio, optical, and X-ray regimes. The peak implies a total energy in the synchrotron-emitting component of a few × 1050erg. The temporal decay rate is most consistent with mildly or non-relativistic material and we do not see evidence for a very energetic off-axis jet, but we cannot distinguish between a lower-energy jet and more isotropic emission.

dc.publisherInstitute of Physics Publishing
dc.titleA Turnover in the Radio Light Curve of GW170817
dc.typeJournal Article
dcterms.source.titleAstrophysical Journal Letters

Copyright © 2018. The American Astronomical Society. All rights reserved.

curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusOpen access

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