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Title:
r-Process Nucleosynthesis in the Early Universe Through Fast Mergers of Compact Binaries in Triple Systems
Authors:
Bonetti, Matteo; Perego, Albino; Capelo, Pedro R.; Dotti, Massimo; Miller, M. Coleman
Affiliation:
AA(DiSAT, Università degli Studi dell'Insubria, Via Valleggio 11, IT-22100 Como, Italy; INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, IT-20126 Milano, Italy), AB(INFN, Sezione di Milano-Bicocca, gruppo collegato di Parma, Parco Area delle Scienze 7/A, IT-43124 Parma, Italy; Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, IT-20126 Milsano, Italy; Dipartimento di Scienze Matematiche Fisiche ed Informatiche, Università di Parma, Parco Area delle Scienze 7/A, IT-43124 Parma, Italy; Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 2, DE-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, DE-64291 Darmstadt, Germany 0000-0002-0936-8237), AC(Center for Theoretical Astrophysics and Cosmology, Institute for Computational Science, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland 0000-0002-1786-963X), AD(INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, IT-20126 Milano, Italy; Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, IT-20126 Milsano, Italy), AE(Department of Astronomy and Joint Space-Science Institute, University of Maryland, College Park, MD 20742-2421, USA)
Publication:
Publications of the Astronomical Society of Australia, Volume 35, id.e017 17 pp. (PASA Homepage)
Publication Date:
05/2018
Origin:
CUP
Astronomy Keywords:
celestial mechanics, gravitation, gravitational waves, ISM: abundances, stars: neutron
Abstract Copyright:
2018: Astronomical Society of Australia
DOI:
10.1017/pasa.2018.11
Bibliographic Code:
2018PASA...35...17B

Abstract

Surface abundance observations of halo stars hint at the occurrence of r-process nucleosynthesis at low metallicity ([Fe/H] < -3), possibly within the first 108 yr after the formation of the first stars. Possible loci of early-Universe r-process nucleosynthesis are the ejecta of either black hole-neutron star or neutron star-neutron star binary mergers. Here, we study the effect of the inclination-eccentricity oscillations raised by a tertiary (e.g. a star) on the coalescence time-scale of the inner compact object binaries. Our results are highly sensitive to the assumed initial distribution of the inner binary semi-major axes. Distributions with mostly wide compact object binaries are most affected by the third object, resulting in a strong increase (by more than a factor of 2) in the fraction of fast coalescences. If instead the distribution preferentially populates very close compact binaries, general relativistic precession prevents the third body from increasing the inner binary eccentricity to very high values. In this last case, the fraction of coalescing binaries is increased much less by tertiaries, but the fraction of binaries that would coalesce within 108 yr even without a third object is already high. Our results provide additional support to the compact-binary merger scenario for r-process nucleosynthesis.
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