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There is irresistible observational evidence that binary systems of compact objects with at least one neutron star are progenitors of short gamma-ray bursts, as well as a production site for r-process elements, at least when some matter is…

高能天体物理现象 · 物理学 2020-09-15 C. J. Krüger , F. Foucart

In the current work we explore the applicability of standard theoretical models of accretion to the observed properties of M51 ULX-7. The spin-up rate and observed X-ray luminosity are evidence of a neutron star with a surface magnetic…

高能天体物理现象 · 物理学 2020-01-08 G. Vasilopoulos , S. K. Lander , F. Koliopanos , C. D. Bailyn

We show that the neutron star minimum period of rotation is determined, for causal equations of state, by the maximum value of the relativistic (compactness) parameter 2GM/Rc^2, allowed by causality for static neutron stars, 0.7081, and by…

天体物理学 · 物理学 2007-05-23 P. Haensel , J. P. Lasota , J. L. Zdunik

We analytically derive, and illustrate with a population synthesis model, the maximum offset of binary neutron star mergers ejected from their host galaxies. This approximate maximum offset is 300 kpc $\times\ (v_\mathrm{esc} / 500\…

高能天体物理现象 · 物理学 2026-03-09 Ilya Mandel , Om Sharan Salafia , Andrew Levan , Paul Disberg

Recently, several accreting neutron stars (NSs) in X-ray binary systems inside supernova remnants have been discovered. They represent a puzzle for the standard magneto-rotational evolution of NSs, as their ages ($\lesssim 10^5$ years) are…

高能天体物理现象 · 物理学 2022-02-23 A. D. Khokhriakova , S. B. Popov

We present a simple model for the evolutionary states of neutron stars in pre-low-mass X-ray binaries during the main sequence stage of donor stars. It is shown that for typical parameters some of the neutron stars in these systems can not…

天体物理学 · 物理学 2009-11-10 S. B. Popov

Motivated by the recent discovery of a compact object with mass in the range $2.5{-}2.67\, \mathrm{M}_\odot$ in the binary merger GW190814, we revisit the question of the maximum mass of neutron stars (NSs). We use a Markov Chain Monte…

高能天体物理现象 · 物理学 2021-06-22 Daniel A. Godzieba , David Radice , Sebastiano Bernuzzi

Models for the evolution of magnetic fields of neutron stars are constructed, assuming the field is embedded in the proton superconducting core of the star. The rate of expulsion of the magnetic flux out of the core, or equivalently the…

天体物理学 · 物理学 2014-10-13 M. Jahan-Miri

External irradiation of a neutron star (NS) accretion disc induces Poynting-Robertson (PR) drag, removing angular momentum and increasing the mass accretion rate. Recent simulations show PR drag significantly enhancing the mass accretion…

高能天体物理现象 · 物理学 2023-09-04 J. Speicher , P. C. Fragile , D. R. Ballantyne

In recent years, the number of pulsars with secure mass measurements has increased to a level that allows us to probe the underlying neutron star mass distribution in detail. We critically review radio pulsar mass measurements and present a…

星系天体物理 · 物理学 2016-02-09 Bulent Kiziltan , Athanasios Kottas , Stephen E. Thorsett

Nuclear burning and its dependence on the mass accretion rate are fundamental ingredients for describing the complicated observational phenomenology of neutron stars in binary systems. Motivated by high quality burst rate data emerging from…

高能天体物理现象 · 物理学 2017-12-20 Yuri Cavecchi , Anna L. Watts , Duncan K. Galloway

We investigate how a phase transition from neutron-star matter to spin-polarized neutron matter affects the equation of state and mass-radius relation of neutron stars. While general extension schemes for the equation of state allow for…

核理论 · 物理学 2020-03-25 I. Tews , A. Schwenk

The conventional picture of disk accretion onto magnetized neutron stars has been challenged by the spin changes observed in a few X-ray pulsars, and by theoretical results from numerical simulations of disk-magnetized star interactions.…

天体物理学 · 物理学 2009-11-11 Hai-Lang Dai , Xiang-Dong Li

Predicting the properties of the matter ejected during and after a neutron star merger is crucial to our ability to use electromagnetic observations of these mergers to constrain the masses of the neutron stars, the equation of state of…

高能天体物理现象 · 物理学 2024-04-30 Francois Foucart , Matthew D. Duez , Lawrence E. Kidder , Harald P. Pfeiffer , Mark A. Scheel

The similarity of rotation periods of, the anomalous X-ray pulsars (AXPs), the soft gamma ray repeaters (SGRs) and the dim thermal neutron stars (DTNs) suggests a common mechanism with an asymptotic spindown phase through the propeller and…

天体物理学 · 物理学 2009-10-31 M. A. Alpar

We present a method of determining lower limits on the masses of pre-main-sequence (PMS) stars and so constraining the PMS evolutionary tracks. This method uses the red-shifted absorption feature observed in some emission-line profiles of T…

We show that the maximum and the minimum mass of merging neutron stars can be estimated with upcoming gravitational wave observations. We simulate populations of binary neutron star signals and model their mass distribution including upper…

高能天体物理现象 · 物理学 2020-09-30 Katerina Chatziioannou , Will M. Farr

Causality alone suffices to set a lower bound on the period of rotation of relativistic stars as a function of their maximum observed mass. That is, by assuming a one-parameter equation of state (EOS) that satisfies v_sound < c and that…

天体物理学 · 物理学 2009-10-28 Scott Koranda , Nikolaos Stergioulas , John L. Friedman

We use axisymmetric magnetohydrodynamic simulations to investigate the spinning-down of magnetars rotating in the propeller regime and moving supersonically through the interstellar medium. The simulations indicate that magnetars spin-down…

天体物理学 · 物理学 2009-11-11 O. D. Toropina , M. M. Romanova , R. V. Lovelace

We study neutrino emission from the remnant of an inspiraling binary neutron star following coalescence. The mass of the merged remnant is likely to exceed the stability limit of a cold, rotating neutron star. However, the angular momentum…

天体物理学 · 物理学 2009-10-30 Thomas W. Baumgarte , Stuart L. Shapiro