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A search for radio emission from double-neutron star merger GW190425 using Apertif

Boersma, O. M. and van Leeuwen, J. and Adams, E. A. K. and Adebahr, B. and Kutkin, A. and Oosterloo, T. and de Blok, W. J. G. and van den Brink, R. and Coolen, A. H. W. M. and Connor, L. and Damstra, S. and Dénes, H. and Hess, K. M. and van der Hulst, J. M. and Hut, B. and Ivashina, M. and Loose, G. M. and Lucero, D. M. and Maan, Y. and Mika, Á. and Moss, V. A. and Mulder, H. and Oostrum, L. C. and Ruiter, M. and van der Schuur, D. and Smits, R. and Vermaas, N. J. and Vohl, D. and Ziemke, J. (2021) A search for radio emission from double-neutron star merger GW190425 using Apertif. Astronomy and Astrophysics, 650 . Art. No. A131. ISSN 0004-6361. doi:10.1051/0004-6361/202140578.

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Context. Detection of the electromagnetic emission from coalescing binary neutron stars (BNS) is important for understanding the merger and afterglow. Aims. We present a search for a radio counterpart to the gravitational-wave (GW) source GW190425, a BNS merger, using Apertif on the Westerbork Synthesis Radio Telescope (WSRT). Methods. We observed a field of high probability in the associated localisation region for three epochs at ΔT = 68, 90, 109 d post merger. We identified all sources that exhibit flux variations consistent with the expected afterglow emission of GW190425. We also looked for possible transients. These are sources that are only present in one epoch. In addition, we quantified our ability to search for radio afterglows in the fourth and future observing runs of the GW detector network using Monte Carlo simulations. Results. We found 25 afterglow candidates based on their variability. None of these could be associated with a possible host galaxy at the luminosity distance of GW190425. We also found 55 transient afterglow candidates that were only detected in one epoch. All of these candidates turned out to be image artefacts. In the fourth observing run, we predict that up to three afterglows will be detectable by Apertif. Conclusions. While we did not find a source related to the afterglow emission of GW190425, the search validates our methods for future searches of radio afterglows.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Boersma, O. M.0000-0002-7925-9503
van Leeuwen, J.0000-0001-8503-6958
Adams, E. A. K.0000-0002-9798-5111
Adebahr, B.0000-0002-5447-6878
Oosterloo, T.0000-0002-0616-6971
de Blok, W. J. G.0000-0001-8957-4518
Connor, L.0000-0002-7587-6352
Dénes, H.0000-0002-9214-8613
Hess, K. M.0000-0001-9662-9089
van der Hulst, J. M.0000-0002-9316-763X
Ivashina, M.0000-0002-6584-1826
Loose, G. M.0000-0003-4721-747X
Maan, Y.0000-0002-0862-6062
Moss, V. A.0000-0002-3005-9738
Oostrum, L. C.0000-0001-8724-8372
van der Schuur, D.0000-0002-9142-1411
Vohl, D.0000-0003-1779-4532
Additional Information:© ESO 2021. Article published by EDP Sciences. Received 16 February 2021; Accepted 7 April 2021; Published online 18 June 2021. We thank Antonia Rowlinson, Mark Kuiack and Kelly Gourdji for the helpful discussions and suggestions about TraP. We thank David Gardenier for a helpful discussion about the Monte Carlo simulations. We thank the anonymous referee for their thoughtful comments which have certainly improved this work. This research was supported by Vici research program ‘ARGO’ with project number 639.043.815, financed by the Dutch Research Council (NWO). J.V.L., Y.M., L.C.O. and R.S. furthermore acknowledge funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement No. 617199 (‘ALERT’), while JMvdH acknowledges ERC funding from (FP/2007-2013)/ERC Grant Agreement No. 291531 (‘HIStoryNU’). EAKA is supported by the WISE research programme, which is financed by NWO. DV acknowledges support from the Netherlands eScience Center (NLeSC) under grant ASDI.15.406. We make use of data from the Apertif system installed at the Westerbork Synthesis Radio Telescope owned by ASTRON. ASTRON, The Netherlands Institute for Radio Astronomy, is an institute of NWO.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)639.043.815
European Research Council (ERC)617199
European Research Council (ERC)291531
Netherlands eScience CenterASDI.15.406
Subject Keywords:gravitational waves – stars: neutron – radio continuum: stars
Record Number:CaltechAUTHORS:20210716-203108331
Persistent URL:
Official Citation:A search for radio emission from double-neutron star merger GW190425 using Apertif. O. M. Boersma, J. van Leeuwen, E. A. K. Adams, B. Adebahr, A. Kutkin, T. Oosterloo, W. J. G. de Blok, R. van den Brink, A. H. W. M. Coolen, L. Connor, S. Damstra, H. Dénes, K. M. Hess, J. M. van der Hulst, B. Hut, M. Ivashina, G. M. Loose, D. M. Lucero, Y. Maan, Á. Mika, V. A. Moss, H. Mulder, L. C. Oostrum, M. Ruiter, D. van der Schuur, R. Smits, N. J. Vermaas, D. Vohl and J. Ziemke. A&A, 650 (2021) A131; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109883
Deposited By: Tony Diaz
Deposited On:16 Jul 2021 22:14
Last Modified:16 Jul 2021 22:14

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