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Constraints on the neutron star equation of state from AT2017gfo using radiative transfer simulations

Coughlin, Michael W. and Dietrich, Tim and Doctor, Zoheyr and Kasen, Daniel and Coughlin, Scott and Jerkstrand, Anders and Leloudas, Giorgos and McBrien, Owen and Metzger, Brian D. and O’Shaughnessy, Richard and Smartt, Stephen J. (2018) Constraints on the neutron star equation of state from AT2017gfo using radiative transfer simulations. Monthly Notices of the Royal Astronomical Society, 480 (3). pp. 3871-3878. ISSN 0035-8711. doi:10.1093/mnras/sty2174.

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The detection of the binary neutron star merger GW170817 together with the observation of electromagnetic counterparts across the entire spectrum inaugurated a new era of multimessenger astronomy. In this study, we incorporate wavelength-dependent opacities and emissivities calculated from atomic-structure data enabling us to model both the measured light curves and spectra of the electromagnetic transient AT2017gfo. Best fits of the observational data are obtained by Gaussian Process Regression, which allows us to present posterior samples for the kilonova and source properties connected to GW170817. Incorporating constraints obtained from the gravitational wave signal measured by the LIGO-Virgo Scientific Collaboration, we present a 90 per cent upper bound on the mass ratio q ≲ 1.38 and a lower bound on the tidal deformability of Λ ≳ 197, which rules out sufficiently soft equations of state. Our analysis is a path-finder for more realistic kilonova models and shows how the combination of gravitational wave and electromagnetic measurements allow for stringent constraints on the source parameters and the supranuclear equation of state.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Coughlin, Michael W.0000-0002-8262-2924
Dietrich, Tim0000-0003-2374-307X
Kasen, Daniel0000-0002-5981-1022
Jerkstrand, Anders0000-0001-8005-4030
Leloudas, Giorgos0000-0002-8597-0756
McBrien, Owen0000-0001-8049-4036
Metzger, Brian D.0000-0002-4670-7509
O’Shaughnessy, Richard0000-0001-5832-8517
Smartt, Stephen J.0000-0002-8229-1731
Additional Information:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model( Accepted 2018 August 7. Received 2018 August 07; in original form 2018 May 25. Published: 09 August 2018. MC is supported by the David and Ellen Lee Postdoctoral Fellowship at the California Institute of Technology. TD acknowledges support by the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 749145, BNSmergers. ZD is supported by NSF Graduate Research Fellowship grant DGE-1144082. SJS acknowledges funding from STFC grant ST/P000312/1. AJ acknowledges funding by the European Union’s Framework Program for Research and Innovation Horizon 2020 under Marie Sklodowska-Curie grant agreement no. 702538. GL is supported by a research grant (19054) from VILLUM FONDEN. ROS is supported by NSF award PHY-1707965.
Funding AgencyGrant Number
David and Ellen Lee Postdoctoral ScholarshipUNSPECIFIED
European Research Council (ERC)749145
NSF Graduate Research FellowshipDGE-1144082
Science and Technology Facilities Council (STFC)ST/P000312/1
Marie Curie Fellowship702538
Villum Foundation19054
Subject Keywords:atomic processes – gravitational waves
Issue or Number:3
Record Number:CaltechAUTHORS:20181130-083138579
Persistent URL:
Official Citation:Michael W Coughlin, Tim Dietrich, Zoheyr Doctor, Daniel Kasen, Scott Coughlin, Anders Jerkstrand, Giorgos Leloudas, Owen McBrien, Brian D Metzger, Richard O’Shaughnessy, Stephen J Smartt; Constraints on the neutron star equation of state from AT2017gfo using radiative transfer simulations, Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 3, 1 November 2018, Pages 3871–3878,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91349
Deposited By: Tony Diaz
Deposited On:30 Nov 2018 17:43
Last Modified:02 Mar 2023 23:16

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