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  1. Article: Kilonovae.

    Metzger, Brian D

    Living reviews in relativity

    2019  Volume 23, Issue 1, Page(s) 1

    Abstract: The coalescence of double neutron star (NS-NS) and black hole (BH)-NS binaries are prime sources of gravitational waves (GW) for Advanced LIGO/Virgo and future ground-based detectors. Neutron-rich matter released from such events undergoes rapid neutron ... ...

    Abstract The coalescence of double neutron star (NS-NS) and black hole (BH)-NS binaries are prime sources of gravitational waves (GW) for Advanced LIGO/Virgo and future ground-based detectors. Neutron-rich matter released from such events undergoes rapid neutron capture (
    Language English
    Publishing date 2019-12-16
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 1416143-6
    ISSN 1433-8351
    ISSN 1433-8351
    DOI 10.1007/s41114-019-0024-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Kilonovae.

    Metzger, Brian D

    Living reviews in relativity

    2017  Volume 20, Issue 1, Page(s) 3

    Abstract: The mergers of double neutron star (NS-NS) and black hole (BH)-NS binaries are promising gravitational wave (GW) sources for Advanced LIGO and future GW detectors. The neutron-rich ejecta from such merger events undergoes rapid neutron capture ( ...

    Abstract The mergers of double neutron star (NS-NS) and black hole (BH)-NS binaries are promising gravitational wave (GW) sources for Advanced LIGO and future GW detectors. The neutron-rich ejecta from such merger events undergoes rapid neutron capture (
    Language English
    Publishing date 2017-05-16
    Publishing country Switzerland
    Document type Journal Article ; Review
    ISSN 1433-8351
    ISSN 1433-8351
    DOI 10.1007/s41114-017-0006-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Three-Dimensional General-Relativistic Magnetohydrodynamic Simulations of Remnant Accretion Disks from Neutron Star Mergers: Outflows and r-Process Nucleosynthesis.

    Siegel, Daniel M / Metzger, Brian D

    Physical review letters

    2017  Volume 119, Issue 23, Page(s) 231102

    Abstract: The merger of binary neutron stars, or of a neutron star and a stellar-mass black hole, can result in the formation of a massive rotating torus around a spinning black hole. In addition to providing collimating media for γ-ray burst jets, unbound ... ...

    Abstract The merger of binary neutron stars, or of a neutron star and a stellar-mass black hole, can result in the formation of a massive rotating torus around a spinning black hole. In addition to providing collimating media for γ-ray burst jets, unbound outflows from these disks are an important source of mass ejection and rapid neutron capture (r-process) nucleosynthesis. We present the first three-dimensional general-relativistic magnetohydrodynamic (GRMHD) simulations of neutrino-cooled accretion disks in neutron star mergers, including a realistic equation of state valid at low densities and temperatures, self-consistent evolution of the electron fraction, and neutrino cooling through an approximate leakage scheme. After initial magnetic field amplification by magnetic winding, we witness the vigorous onset of turbulence driven by the magnetorotational instability (MRI). The disk quickly reaches a balance between heating from MRI-driven turbulence and neutrino cooling, which regulates the midplane electron fraction to a low equilibrium value Y_{e}≈0.1. Over the 380-ms duration of the simulation, we find that a fraction ≈20% of the initial torus mass is unbound in powerful outflows with asymptotic velocities v≈0.1c and electron fractions Y_{e}≈0.1-0.25. Postprocessing the outflows through a nuclear reaction network shows the production of a robust second- and third-peak r process. Though broadly consistent with the results of previous axisymmetric hydrodynamical simulations, extrapolation of our results to late times suggests that the total ejecta mass from GRMHD disks is significantly higher. Our results provide strong evidence that postmerger disk outflows are an important site for the r process.
    Language English
    Publishing date 2017-12-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.119.231102
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  4. Article ; Online: Collapsars as a major source of r-process elements.

    Siegel, Daniel M / Barnes, Jennifer / Metzger, Brian D

    Nature

    2019  Volume 569, Issue 7755, Page(s) 241–244

    Abstract: The production of elements by rapid neutron capture (r-process) in neutron-star mergers is expected theoretically and is supported by multimessenger ... ...

    Abstract The production of elements by rapid neutron capture (r-process) in neutron-star mergers is expected theoretically and is supported by multimessenger observations
    Language English
    Publishing date 2019-05-08
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-019-1136-0
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  5. Book ; Online: A Toy Model for the Time-Frequency Structure of Fast Radio Bursts

    Metzger, Brian D. / Sridhar, Navin / Margalit, Ben / Beniamini, Paz / Sironi, Lorenzo

    Implications for the CHIME Burst Dichotomy

    2021  

    Abstract: We introduce a toy model for the time-frequency structure of fast radio bursts (FRB), in which the observed emission is produced as a narrowly-peaked intrinsic spectral energy distribution sweeps down in frequency across the instrumental bandpass as a ... ...

    Abstract We introduce a toy model for the time-frequency structure of fast radio bursts (FRB), in which the observed emission is produced as a narrowly-peaked intrinsic spectral energy distribution sweeps down in frequency across the instrumental bandpass as a power-law in time. Though originally motivated by emission models which invoke a relativistic shock, the model could in principle apply to a wider range of emission scenarios. We quantify the burst's detectability using the frequency bandwidth over which most of its signal-to-noise ratio (SNR) is accumulated. We demonstrate that by varying just a single parameter of the toy model-the power-law index \beta of the frequency drift rate-one can transform a long (and hence preferentially time-resolved) burst with a narrow time-integrated spectrum into a shorter burst with a broad power-law time-integrated spectrum. We suggest that burst-to-burst diversity in the value of \beta could generate the dichotomy between burst duration and frequency-width recently found by CHIME. In shock models, the value of \beta is related to the radial density profile of external medium, which in light of the preferentially longer duration of bursts from repeating sources may point to diversity in the external environments surrounding repeating versus one-off FRB sources.

    Comment: 11 pages, 7 figures, to be submitted to ApJ, comments appreciated
    Keywords Astrophysics - High Energy Astrophysical Phenomena
    Subject code 520 ; 612
    Publishing date 2021-10-20
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Does the Collapse of a Supramassive Neutron Star Leave a Debris Disk?

    Margalit, Ben / Metzger, Brian D / Beloborodov, Andrei M

    Physical review letters

    2015  Volume 115, Issue 17, Page(s) 171101

    Abstract: One possible channel for black hole formation is the collapse of a rigidly rotating massive neutron star as it loses its angular momentum or gains excessive mass through accretion. It was proposed that part of the neutron star may form a debris disk ... ...

    Abstract One possible channel for black hole formation is the collapse of a rigidly rotating massive neutron star as it loses its angular momentum or gains excessive mass through accretion. It was proposed that part of the neutron star may form a debris disk around the black hole. Such short-lived massive disks could be the sources of powerful jets emitting cosmological gamma-ray bursts. Whether the collapse creates a disk depends on the equation of state of the neutron star. We survey a wide range of equations of states allowed by observations and find that disk formation is unfeasible. We conclude that this channel of black hole formation is incapable of producing powerful jets, and discuss implications for models of gamma-ray bursts.
    Language English
    Publishing date 2015-10-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.115.171101
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  7. Article ; Online: A blue ring nebula from a stellar merger several thousand years ago.

    Hoadley, Keri / Martin, D Christopher / Metzger, Brian D / Seibert, Mark / McWilliam, Andrew / Shen, Ken J / Neill, James D / Stefansson, Gudmundur / Monson, Andrew / Schaefer, Bradley E

    Nature

    2020  Volume 587, Issue 7834, Page(s) 387–391

    Abstract: Stellar mergers are a brief but common phase in the evolution of binary star ... ...

    Abstract Stellar mergers are a brief but common phase in the evolution of binary star systems
    Language English
    Publishing date 2020-11-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-020-2893-5
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  8. Article: Formation of high-field magnetic white dwarfs from common envelopes

    Nordhaus, Jason / Wellons, Sarah / Spiegel, David S / Metzger, Brian D / Blackman, Eric G

    Proceedings of the National Academy of Sciences of the United States of America. 2011 Feb. 22, v. 108, no. 8

    2011  

    Abstract: The origin of highly magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately related to strong binary interactions during post-main- ... ...

    Abstract The origin of highly magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately related to strong binary interactions during post-main-sequence phases of stellar evolution. If a low-mass companion, such as a planet, brown dwarf, or low-mass star, is engulfed by a post-main-sequence giant, gravitational torques in the envelope of the giant lead to a reduction of the companion's orbit. Sufficiently low-mass companions in-spiral until they are shredded by the strong gravitational tides near the white dwarf core. Subsequent formation of a super-Eddington accretion disk from the disrupted companion inside a common envelope can dramatically amplify magnetic fields via a dynamo. Here, we show that these disk-generated fields are sufficiently strong to explain the observed range of magnetic field strengths for isolated, high-field magnetic white dwarfs. A higher-mass binary analogue may also contribute to the origin of magnetar fields.
    Keywords evolution ; magnetic fields ; tides
    Language English
    Dates of publication 2011-0222
    Size p. 3135-3140.
    Publishing place National Academy of Sciences
    Document type Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1015005108
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Formation of high-field magnetic white dwarfs from common envelopes.

    Nordhaus, Jason / Wellons, Sarah / Spiegel, David S / Metzger, Brian D / Blackman, Eric G

    Proceedings of the National Academy of Sciences of the United States of America

    2011  Volume 108, Issue 8, Page(s) 3135–3140

    Abstract: The origin of highly magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately related to strong binary interactions during post-main- ... ...

    Abstract The origin of highly magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately related to strong binary interactions during post-main-sequence phases of stellar evolution. If a low-mass companion, such as a planet, brown dwarf, or low-mass star, is engulfed by a post-main-sequence giant, gravitational torques in the envelope of the giant lead to a reduction of the companion's orbit. Sufficiently low-mass companions in-spiral until they are shredded by the strong gravitational tides near the white dwarf core. Subsequent formation of a super-Eddington accretion disk from the disrupted companion inside a common envelope can dramatically amplify magnetic fields via a dynamo. Here, we show that these disk-generated fields are sufficiently strong to explain the observed range of magnetic field strengths for isolated, high-field magnetic white dwarfs. A higher-mass binary analogue may also contribute to the origin of magnetar fields.
    Language English
    Publishing date 2011-02-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1015005108
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: A kilonova following a long-duration gamma-ray burst at 350 Mpc.

    Rastinejad, Jillian C / Gompertz, Benjamin P / Levan, Andrew J / Fong, Wen-Fai / Nicholl, Matt / Lamb, Gavin P / Malesani, Daniele B / Nugent, Anya E / Oates, Samantha R / Tanvir, Nial R / de Ugarte Postigo, Antonio / Kilpatrick, Charles D / Moore, Christopher J / Metzger, Brian D / Ravasio, Maria Edvige / Rossi, Andrea / Schroeder, Genevieve / Jencson, Jacob / Sand, David J /
    Smith, Nathan / Fernández, José Feliciano Agüí / Berger, Edo / Blanchard, Peter K / Chornock, Ryan / Cobb, Bethany E / De Pasquale, Massimiliano / Fynbo, Johan P U / Izzo, Luca / Kann, D Alexander / Laskar, Tanmoy / Marini, Ester / Paterson, Kerry / Escorial, Alicia Rouco / Sears, Huei M / Thöne, Christina C

    Nature

    2022  Volume 612, Issue 7939, Page(s) 223–227

    Abstract: Gamma-ray bursts (GRBs) are divided into two ... ...

    Abstract Gamma-ray bursts (GRBs) are divided into two populations
    MeSH term(s) Humans ; Astronomy ; Dwarfism ; Gravitation ; Osteochondrodysplasias ; Stars, Celestial
    Language English
    Publishing date 2022-12-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-05390-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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