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Standardizing kilonovae and their use as standard candles to measure the Hubble constant

Coughlin, Michael W. and Dietrich, Tim and Heinzel, Jack and Khetan, Nandita and Antier, Sarah and Bulla, Mattia and Christensen, Nelson and Coulter, David A. and Foley, Ryan J. (2020) Standardizing kilonovae and their use as standard candles to measure the Hubble constant. Physical Review Research, 2 (2). Art. No. 022006(R). ISSN 2643-1564.

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The detection of GW170817 is revolutionizing many areas of astrophysics with the joint observation of gravitational waves and electromagnetic emissions. These multimessenger events provide a new approach to determine the Hubble constant, thus, they are a promising candidate for mitigating the tension between measurements of type-Ia supernovae via the local distance ladder and the cosmic microwave background. In addition to the “standard siren” provided by the gravitational-wave measurement, the kilonova itself has characteristics that allow one to improve existing measurements or to perform yet another, independent measurement of the Hubble constant without gravitational-wave information. Here, we employ standardization techniques borrowed from the type-Ia community and apply them to kilonovae, not using any information from the gravitational-wave signal. We use two versions of this technique, one derived from direct observables measured from the light curve, and the other based on inferred ejecta parameters, e.g., mass, velocity, and composition, for two different models. These lead to Hubble Constant measurements of H₀ = 109⁺⁴⁹₋₃₅ km s⁻¹ Mpc⁻¹ for the measured analysis, and H₀ = 85⁺²²₋₁₇ km ⁻¹ Mpc⁻¹ and H₀ = 79⁺²³₋₁₅ km s⁻¹ Mpc⁻¹ for the inferred analyses. This measurement has error bars within ~2 to the gravitational-wave measurements (H₀ = 74⁺¹⁶₋₈ km s⁻¹ Mpc⁻¹), showing its promise as an independent constraint on H₀.

Item Type:Article
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URLURL TypeDescription Paper
Coughlin, Michael W.0000-0002-8262-2924
Khetan, Nandita0000-0003-2720-8904
Antier, Sarah0000-0002-7686-3334
Bulla, Mattia0000-0002-8255-5127
Alternate Title:On standardizing kilonovae and their use as standard candles to measure the Hubble constant, Using kilonovae as standard candles to measure the Hubble Constant
Additional Information:© 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. (Received 2 August 2019; accepted 26 February 2020; published 9 April 2020) The authors would like to thank Daniel Kasen for making his models publicly available. M.W.C. is supported by the David and Ellen Lee Postdoctoral Fellowship at the California Institute of Technology. T.D. acknowledges support by the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 749145, BNSmergers. N.C. and J.H. acknowledge support from the National Science Foundation with Grant No. PHY-1806990. S.A. is supported by the CNES Postdoctoral Fellowship at Laboratoire Astroparticle et Cosmologie. The UCSC team is supported in part by NASA Grant No. NNG17PX03C, NSF Grants No. AST-1518052 and No. AST-1911206, the Gordon & Betty Moore Foundation, the Heising-Simons Foundation, and by a fellowship from the David and Lucile Packard Foundation to R.J.F. D.A.C. acknowledges support from the National Science Foundation Graduate Research Fellowship under Grant No. DGE1339067.
Funding AgencyGrant Number
David and Ellen Lee Postdoctoral ScholarshipUNSPECIFIED
European Research Council (ERC)749145
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Heising-Simons FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
NSF Graduate Research FellowshipDGE-1339067
Issue or Number:2
Classification Code:PACS numbers: 95.75.-z, 04.30.-w
Record Number:CaltechAUTHORS:20190906-112634232
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98488
Deposited By: George Porter
Deposited On:06 Sep 2019 20:49
Last Modified:10 Apr 2020 16:31

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