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Using neutron star observations to determine crust thicknesses, moments of inertia, and tidal deformabilities

Journal Article · · Physical Review C, Nuclear Physics
 [1];  [2];  [3];  [4]
  1. Univ. of Washington, Seattle, WA (United States); Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Texas A & M Univ., Commerce, TX (United States); Indiana Univ., Bloomington, IN (United States)
  4. Texas A & M Univ., Commerce, TX (United States)

Here, we perform a systematic assessment of models for the equation of state (EOS) of dense matter in the context of recent neutron star mass and radius measurements to obtain a broad picture of the structure of neutron stars. We demonstrate that currently available neutron star mass and radius measurements provide strong constraints on moments of inertia, tidal deformabilities, and crust thicknesses. Moreover, a measurement of the moment of inertia of PSR J0737-3039A with a 10% error, without any other information from observations, will constrain the EOS over a range of densities to within 50% 60%. We find tidal deformabilities between 0.6 and 6 1036 g cm2 s2 (to 95% confidence) for M = 1.4 M , and any measurement which constrains this range will provide an important constraint on dense matter. The crustal fraction of the moment of inertia can be as large as 10% for M = 1.4 M permitting crusts to have a large enough moment of inertia reservoir to explain glitches in the Vela pulsar even with a large amount of superfluid entrainment. Finally, due to the uncertainty in the equation of state, there is at least a 40% variation in the thickness of the crust for a fixed mass and radius, which implies that future simulations of the cooling of a neutron star crust which has been heated by accretion will need to take this variation into account.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265810
Alternate ID(s):
OSTI ID: 1409749
OSTI ID: 1180490
Journal Information:
Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 1 Vol. 91; ISSN 0556-2813; ISSN PRVCAN
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Connecting Neutron Star Observations to Three-Body Forces in Neutron Matter and to the Nuclear Symmetry Energy text January 2011
Measurability of the tidal polarizability of neutron stars in late-inspiral gravitational-wave signals text January 2012
The Neutron Star Mass-Radius Relation and the Equation of State of Dense Matter text January 2012
Constraining the High-Density Behavior of Nuclear Symmetry Energy with the Tidal Polarizability of Neutron Stars text January 2012
Crustal Entrainment and Pulsar Glitches text January 2012
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A Massive Pulsar in a Compact Relativistic Binary text January 2013
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Pulsar Glitches: The Crust may be Enough text January 2014
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Constraining the Equation of State with Moment of Inertia Measurements text January 2004
Neutron Star Observations: Prognosis for Equation of State Constraints text January 2006
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Cited By (33)

Equation of state constraints for the cold dense matter inside neutron stars using the cooling tail method journal June 2016
The fate of the Compact Remnant in Neutron star Mergers journal October 2015
Quantifying the uncertainties on spinodal instability for stellar matter through meta-modeling journal May 2019
From the microscopic to the macroscopic world: from nucleons to neutron stars journal August 2019
From hadrons to quarks in neutron stars: a review journal March 2018
A pitfall of piecewise-polytropic equation of state inference journal May 2018
Constraining the mass and radius of neutron stars in globular clusters journal January 2018
NGC 300 ULX1: spin evolution, super-Eddington accretion, and outflows journal August 2019
M51 ULX-7: superorbital periodicity and constraints on the neutron star magnetic field journal December 2019
Constraining magnetic fields through plasma lensing: application to the Black Widow pulsar journal January 2019
Spectrum of shear modes in the neutron-star crust: Estimating the nuclear-physics uncertainties journal January 2017
Mass-radius relation for neutron stars in f ( R ) = R + α R 2 gravity: A comparison between purely metric and torsion formulations journal February 2020
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral journal October 2017
Neutron Skins and Neutron Stars in the Multimessenger Era journal April 2018
Neutron Star Tidal Deformabilities Constrained by Nuclear Theory and Experiment journal August 2018
GW170817: Measurements of Neutron Star Radii and Equation of State journal October 2018
Quantum Monte Carlo methods for nuclear physics journal September 2015
Neutron star radii, universal relations, and the role of prior distributions journal February 2016
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral other January 2017
Testing the Formation Scenarios of Binary Neutron Star Systems with Measurements of the Neutron Star Moment of Inertia journal March 2018
Constraining the Speed of Sound inside Neutron Stars with Chiral Effective Field Theory Interactions and Observations journal June 2018
Crust-cooling Models Are Insensitive to the Crust–Core Transition Pressure for Realistic Equations of State journal September 2019
The Fate of the Compact Remnant in Neutron Star Mergers text January 2015
Equation of state constraints for the cold dense matter inside neutron stars using the cooling tail method text January 2015
Testing the formation scenarios of binary neutron star systems with measurements of the neutron star moment of inertia text January 2016
From hadrons to quarks in neutron stars: a review text January 2017
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral text January 2017
Neutron skins and neutron stars in the multi-messenger era text January 2017
Constraining the speed of sound inside neutron stars with chiral effective field theory interactions and observations text January 2018
A pitfall of piecewise-polytropic equation of state inference text January 2018
From the microscopic to the macroscopic world: from nucleons to neutron stars text January 2019
NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows text January 2019
GW170817: Observation of gravitational waves from a binary neutron star inspiral text January 2017

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