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Magnetars from Neutron Star--White Dwarf Mergers: Application to Fast Radio Bursts
High Energy Astrophysical Phenomena · Submitted 27 Feb 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This NSWD channel is also able to well explain both the observational properties of FRB 180924-like and FRB 180916.J0158+65-like FRBs within a large range in local environments and host galaxies.
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The abstract, sentence by sentence
It is widely believed that magnetars could be born in core-collapse supernovae (SNe), binary neutron star (BNS) or binary white dwarf (BWD) mergers, or accretion-induced collapse (AIC) of white dwarfs. In this paper, we investigate whether magnetars could also be produced from neutron star--white dwarf (NSWD) mergers, motivated by FRB 180924-like fast radio bursts (FRBs) possibly from magnetars born in BNS/BWD/AIC channels suggested by \cite{mar19}. By a preliminary calculation, we find that NSWD mergers with unstable mass transfer could result in the NS acquiring an ultra-strong magnetic field via the dynamo mechanism due to differential rotation and convection or possibly via the magnetic flux conservation scenario of a fossil field. If NSWD mergers can indeed create magnetars, then such objects could produce at least a subset of FRB 180924-like FRBs within the framework of flaring magnetars, since the ejecta, local environments, and host galaxies of the final remnants from NSWD mergers resemble those of BNS/BWD/AIC channels. This NSWD channel is also able to well explain both the observational properties of FRB 180924-like and FRB 180916.J0158+65-like FRBs within a large range in local environments and host galaxies.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | It is widely believed that magnetars could be born in core-collapse supernovae (SNe), binary neutron star (BNS) or binary white dwarf (BWD) mergers, or accretion-induced collapse (AIC) of white dwarfs. | background 1.00 | 0.03 | 0.03 | hedged possibility 0.85 |
| s1 | In this paper, we investigate whether magnetars could also be produced from neutron star--white dwarf (NSWD) mergers, motivated by FRB 180924-like fast radio bursts (FRBs) possibly from magnetars born in BNS/BWD/AIC channels suggested by \cite{mar19}. | contribution 0.96 | 0.36 | 0.07 | hedged possibility 0.91 |
| s2 | By a preliminary calculation, we find that NSWD mergers with unstable mass transfer could result in the NS acquiring an ultra-strong magnetic field via the dynamo mechanism due to differential rotation and convection or possibly via the magnetic flux conservation scenario of a fossil field. | result 0.98 | 0.94 | 0.13 | hedged possibility 0.54 |
| s3 | If NSWD mergers can indeed create magnetars, then such objects could produce at least a subset of FRB 180924-like FRBs within the framework of flaring magnetars, since the ejecta, local environments, and host galaxies of the final remnants from NSWD mergers resemble those of BNS/BWD/AIC channels. | interpretation 0.95 | 0.42 | 0.40 | hedged possibility 1.00 |
| s4 | This NSWD channel is also able to well explain both the observational properties of FRB 180924-like and FRB 180916.J0158+65-like FRBs within a large range in local environments and host galaxies. | result 0.68 | 0.72 | 0.40 | asserted 0.95 |
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The paper
Original abstract
It is widely believed that magnetars could be born in core-collapse supernovae (SNe), binary neutron star (BNS) or binary white dwarf (BWD) mergers, or accretion-induced collapse (AIC) of white dwarfs. In this paper, we investigate whether magnetars could also be produced from neutron star--white dwarf (NSWD) mergers, motivated by FRB 180924-like fast radio bursts (FRBs) possibly from magnetars born in BNS/BWD/AIC channels suggested by \cite{mar19}. By a preliminary calculation, we find that NSWD mergers with unstable mass transfer could result in the NS acquiring an ultra-strong magnetic field via the dynamo mechanism due to differential rotation and convection or possibly via the magnetic flux conservation scenario of a fossil field. If NSWD mergers can indeed create magnetars, then such objects could produce at least a subset of FRB 180924-like FRBs within the framework of flaring magnetars, since the ejecta, local environments, and host galaxies of the final remnants from NSWD mergers resemble those of BNS/BWD/AIC channels. This NSWD channel is also able to well explain both the observational properties of FRB 180924-like and FRB 180916.J0158+65-like FRBs within a large range in local environments and host galaxies.
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References
How the literature uses it
3 arXiv papers cite this in 4 sentences
Papers citing it · 3 sentences without a confident label
Cites it as background 1 paper
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Magnetars can be produced through at least two distinct evolutionary channels: the core-collapse of massive stars and compact binary mergers ( [ref] ; [ref] ; [ref] ; [ref] ).
Constraining the Supernova Remnant Environment of FRB 190520B with Dispersion Measure and Scattering Timescale · Introduction · 0.84
What it cites · 1 sentence without a confident label
Uses data or values from 2 papers
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The volumetric event rate of NSWD mergers is in a range of $(0.5-1)×10^4 Gpc^-3yr^-1$ in the local universe, which is $∼2.5×10^3-1×10^4$ times more than that of the observed LGRBs [ref] but roughly lower than that of FRBs by one order of magnitude [ref] .
A High Rate of White Dwarf-Neutron Star Mergers & Their Transients · Explanations of Observational Properties of FRB 180924-like Bursts · 0.84
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They are millisecond-duration coherent radio pulses with average upper limits of the peak luminosity $L_p∼1×10^42-8×10^44 erg s^-1$ and energy $E∼7×10^39-2×10^42 erg$ [ref] , characterized by a single peak mainly or multiple peaks rarely [ref] , phenomenally divided into repeating bursts [ref] and non-repeating bursts.
Nine New Repeating Fast Radio Burst Sources from CHIME/FRB · Introduction · 0.82
Cites as background 3 papers
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One interesting group of models relevant to a young flaring magnetar with single or clustered flares have been proposed to give rise to non-repeating or repeating bursts, respectively [ref] .
Blast Waves from Magnetar Flares and Fast Radio Bursts · Introduction · 0.84
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The explosive outcomes of NSWD mergers have been explored in the literature [ref] , but the final remnants of these events have been little investigated [ref] .
Faint rapid red transients from Neutron star -- CO white-dwarf mergers · Magnetars from NSWD Mergers · 0.97
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This channel has also been briefly mentioned and/or discussed by [ref] , [ref] , and [ref] previously.
The remnant of neutron star-white dwarf merger and the repeating fast radio bursts · Introduction · 0.96
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