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Measuring the Hubble constant with a sample of kilonovae
Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA.;CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA..ORCID iD: 0000-0002-8262-2924
APC, UMR 7164, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris, France..
Univ Potsdam, Inst Phys & Astron, Haus 28,Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.;Nikhef, Sci Pk 105, NL-1098 XG Amsterdam, Netherlands..
Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA..
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2020 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 11, no 1, article id 4129Article in journal (Refereed) Published
Abstract [en]

Kilonovae produced by the coalescence of compact binaries with at least one neutron star are promising standard sirens for an independent measurement of the Hubble constant (H-0). Through their detection via follow-up of gravitational-wave (GW), short gamma-ray bursts (sGRBs) or optical surveys, a large sample of kilonovae (even without GW data) can be used for H-0 contraints. Here, we show measurement of H-0 using light curves associated with four sGRBs, assuming these are attributable to kilonovae, combined with GW170817. Including a systematic uncertainty on the models that is as large as the statistical ones, we find H0=73.8-5.8+6.3</mml:msubsup><mml:mspace width="0.33em"></mml:mspace>km<mml:mspace width="0.33em"></mml:mspace>s-1<mml:mspace width="0.33em"></mml:mspace>Mpc-1 and <mml:msub>H0=71.2-3.1+3.2<mml:mspace width="0.33em"></mml:mspace>km<mml:mspace width="0.33em"></mml:mspace>s-1<mml:mspace width="0.33em"></mml:mspace>Mpc-1 for two different kilonova models that are consistent with the local and inverse-distance ladder measurements. For a given model, this measurement is about a factor of 2-3 more precise than the standard-siren measurement for GW170817 using only GWs. Kilonovae observations can be used to out constraints on the Hubble constant (H0). Here, the authors show H0 measurements by combining light curves of four short gamma-ray burts with GW170817 are about a factor of 2-3 more precise than the standard-siren measurements using only gravitational-waves.

Place, publisher, year, edition, pages
Nature Publishing Group, 2020. Vol. 11, no 1, article id 4129
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:kth:diva-281521DOI: 10.1038/s41467-020-17998-5ISI: 000563565300020PubMedID: 32807780Scopus ID: 2-s2.0-85089500189OAI: oai:DiVA.org:kth-281521DiVA, id: diva2:1502966
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QC 20201123

Available from: 2020-11-23 Created: 2020-11-23 Last updated: 2023-03-28Bibliographically approved

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Bulla, Mattia

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