Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disc ejecta from neutron star mergers

Lippuner, Jonas; Fernández, Rodrigo; Roberts, Luke F.; Foucart, Francois; Kasen, Daniel; Metzger, Brian D.; Ott, Christian D.

doi:10.1093/mnras/stx1987

Title: Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disc ejecta from neutron star mergers

Journal Article · Wed Aug 09 00:00:00 EDT 2017 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stx1987· OSTI ID:1526485

Lippuner, Jonas ^[1]; Fernández, Rodrigo ^[2]; Roberts, Luke F. ^[3]; Foucart, Francois ^[4]; Kasen, Daniel ^[5]; Metzger, Brian D. ^[4]; Ott, Christian D. ^[6]

California Inst. of Technology (CalTech), Pasadena, CA (United States)
Univ. of Alberta, Edmonton, AB (Canada); Univ. of California, Berkeley, CA (United States)
Michigan State Univ., East Lansing, MI (United States)
Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States); Kyoto Univ. (Japan)

We investigate the nucleosynthesis of heavy elements in the winds ejected by accretion discs formed in neutron star mergers. We compute the element formation in disc outflows from hypermassive neutron star (HMNS) remnants of variable lifetime, including the effect of angular momentum transport in the disc evolution. We employ long-term axisymmetric hydrodynamic disc simulations to model the ejecta, and compute r-process nucleosynthesis with tracer particles using a nuclear reaction network containing ~8000 species. We find that the previously known strong correlation between HMNS lifetime, ejected mass and average electron fraction in the outflow is directly related to the amount of neutrino irradiation on the disc, which dominates mass ejection at early times in the form of a neutrino-driven wind. Production of lanthanides and actinides saturates at short HMNS lifetimes (≲10 ms), with additional ejecta contributing to a blue optical kilonova component for longer-lived HMNSs. We find good agreement between the abundances from the disc outflow alone and the solar r-process distribution only for short HMNS lifetimes (≲10 ms). For longer lifetimes, the rare-earth and third r-process peaks are significantly underproduced compared to the solar pattern, requiring additional contributions from the dynamical ejecta. The nucleosynthesis signature from a spinning black hole (BH) can only overlap with that from an HMNS of moderate lifetime (≲60 ms). Finally, we show that angular momentum transport not only contributes with a late-time outflow component, but that it also enhances the neutrino-driven component by moving material to shallower regions of the gravitational potential, in addition to providing additional heating.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

OSTI ID:: 1526485

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 472, Issue 1; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 129 works

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Sustained Magnetorotational Turbulence in Local Simulations of Stratified Disks with Zero Net Magnetic Flux Davis, S. W.; Stone, J. M.; Pessah, M. E. arXiv https://doi.org/10.48550/arxiv.0909.1570	text	January 2009
Integrated Nucleosynthesis in Neutrino Driven Winds Roberts, L. F.; Woosley, S. E.; Hoffman, R. D. arXiv https://doi.org/10.48550/arxiv.1004.4916	text	January 2010
Electromagnetic Transients Powered by Nuclear Decay in the Tidal Tails of Coalescing Compact Binaries Roberts, Luke F.; Kasen, Dan; Lee, William H. arXiv https://doi.org/10.48550/arxiv.1104.5504	text	January 2011
Importance of cooling in triggering the collapse of hypermassive neutron stars Paschalidis, Vasileios; Etienne, Zachariah B.; Shapiro, Stuart L. arXiv https://doi.org/10.48550/arxiv.1208.5487	text	January 2012
The mass ejection from the merger of binary neutron stars Hotokezaka, Kenta; Kiuchi, Kenta; Kyutoku, Koutarou arXiv https://doi.org/10.48550/arxiv.1212.0905	text	January 2012
Effect of a High Opacity on the Light Curves of Radioactively Powered Transients from Compact Object Mergers Barnes, Jennifer; Kasen, Daniel arXiv https://doi.org/10.48550/arxiv.1303.5787	text	January 2013
The r-process in proto-neutron-star wind revisited Wanajo, Shinya arXiv https://doi.org/10.48550/arxiv.1305.0371	text	January 2013
Radiative Transfer Simulations for Neutron Star Merger Ejecta Tanaka, Masaomi; Hotokezaka, Kenta arXiv https://doi.org/10.48550/arxiv.1306.3742	text	January 2013
The Influence of Thermal Pressure on Equilibrium Models of Hypermassive Neutron Star Merger Remnants Kaplan, J. D.; Ott, C. D.; O'Connor, E. P. arXiv https://doi.org/10.48550/arxiv.1306.4034	text	January 2013
The long-term evolution of neutron star merger remnants - I. The impact of r-process nucleosynthesis Rosswog, S.; Korobkin, O.; Arcones, A. arXiv https://doi.org/10.48550/arxiv.1307.2939	text	January 2013
Numerical Relativity and Astrophysics Lehner, Luis; Pretorius, Frans arXiv https://doi.org/10.48550/arxiv.1405.4840	text	January 2014
Outflows from accretion disks formed in neutron star mergers: effect of black hole spin Fernández, Rodrigo; Kasen, Daniel; Metzger, Brian D. arXiv https://doi.org/10.48550/arxiv.1409.4426	text	January 2014
Multi-messenger picture of compact binary mergers Rosswog, S. arXiv https://doi.org/10.48550/arxiv.1501.02081	text	January 2015
Neutrino-driven winds in the aftermath of a neutron star merger: nucleosynthesis and electromagnetic transients Martin, Dirk; Perego, Albino; Arcones, Almudena arXiv https://doi.org/10.48550/arxiv.1506.05048	text	January 2015
Monte Carlo Neutrino Transport Through Remnant Disks from Neutron Star Mergers Richers, S.; Kasen, D.; O'Connor, Evan arXiv https://doi.org/10.48550/arxiv.1507.03606	text	January 2015
r-Process Lanthanide Production and Heating Rates in Kilonovae Lippuner, Jonas; Roberts, Luke F. arXiv https://doi.org/10.48550/arxiv.1508.03133	text	January 2015
Electromagnetic Signatures of Neutron Star Mergers in the Advanced LIGO Era Fernández, Rodrigo; Metzger, Brian D. arXiv https://doi.org/10.48550/arxiv.1512.05435	text	January 2015
The Influence of Neutrinos on r-Process Nucleosynthesis in the Ejecta of Black Hole-Neutron Star Mergers Roberts, Luke F.; Lippuner, Jonas; Duez, Matthew D. arXiv https://doi.org/10.48550/arxiv.1601.07942	text	January 2016
The r-process nucleosynthesis: a continued challenge for nuclear physics and astrophysics Goriely, S.; Demetriou, P.; Janka, H. -Th. arXiv https://doi.org/10.48550/arxiv.astro-ph/0410429	text	January 2004
Torus Formation in Neutron Star Mergers and Well-Localized Short Gamma-Ray Bursts Oechslin, R.; Janka, H. -Th. arXiv https://doi.org/10.48550/arxiv.astro-ph/0507099	text	January 2005
Vertical Structure of Gas Pressure-Dominated Accretion Disks with Local Dissipation of Turbulence and Radiative Transport Hirose, Shigenobu; Krolik, Julian H.; Stone, James M. arXiv https://doi.org/10.48550/arxiv.astro-ph/0510741	text	January 2005
Evolution of Protoneutron Stars Pons, J. A.; Reddy, S.; Prakash, M. arXiv https://doi.org/10.48550/arxiv.astro-ph/9807040	text	January 1998
Transient Events from Neutron Star Mergers Li, Li-Xin; Paczyński, Bohdan arXiv https://doi.org/10.48550/arxiv.astro-ph/9807272	text	January 1998
Fission barriers of neutron-rich and superheavy nuclei calculated with the ETFSI method Mamdouh, A.; Pearson, J. M.; Rayet, M. arXiv https://doi.org/10.48550/arxiv.nucl-th/0010093	text	January 2000

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