FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION
The increasing number and precision of measurements of neutron star masses, radii, and, in the near future, moments of inertia offer the possibility of precisely determining the neutron star equation of state (EOS). One way to facilitate the mapping of observables to the EOS is through a parametriza...
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6220542017-01-23T03:00:34Z FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION Raithel, Carolyn A. Özel, Feryal Psaltis, Dimitrios Univ Arizona, Dept Astron Univ Arizona, Steward Observ equation of state stars: interiors stars: neutron The increasing number and precision of measurements of neutron star masses, radii, and, in the near future, moments of inertia offer the possibility of precisely determining the neutron star equation of state (EOS). One way to facilitate the mapping of observables to the EOS is through a parametrization of the latter. We present here a generic method for optimizing the parametrization of any physically allowed EOS. We use mock EOS that incorporate physically diverse and extreme behavior to test how well our parametrization reproduces the global properties of the stars, by minimizing the errors in the observables of mass, radius, and the moment of inertia. We find that using piecewise polytropes and sampling the EOS with five fiducial densities between similar to 1-8 times the nuclear saturation density results in optimal errors for the smallest number of parameters. Specifically, it recreates the radii of the assumed EOS to within less than 0.5 km for the extreme mock EOS and to within less than 0.12 km for 95% of a sample of 42 proposed, physically motivated EOS. Such a parametrization is also able to reproduce the maximum mass to within 0.04 M-circle dot and the moment of inertia of a 1.338 M-circle dot. neutron star to within less than 10% for 95% of the proposed sample of EOS. 2016-10-26 Article FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION 2016, 831 (1):44 The Astrophysical Journal 1538-4357 10.3847/0004-637X/831/1/44 http://hdl.handle.net/10150/622054 http://arizona.openrepository.com/arizona/handle/10150/622054 The Astrophysical Journal en http://stacks.iop.org/0004-637X/831/i=1/a=44?key=crossref.766f7d790f09e4c490ed9e8856cd1735 © 2016. The American Astronomical Society. All rights reserved. IOP PUBLISHING LTD |
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en |
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equation of state stars: interiors stars: neutron |
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equation of state stars: interiors stars: neutron Raithel, Carolyn A. Özel, Feryal Psaltis, Dimitrios FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
description |
The increasing number and precision of measurements of neutron star masses, radii, and, in the near future, moments of inertia offer the possibility of precisely determining the neutron star equation of state (EOS). One way to facilitate the mapping of observables to the EOS is through a parametrization of the latter. We present here a generic method for optimizing the parametrization of any physically allowed EOS. We use mock EOS that incorporate physically diverse and extreme behavior to test how well our parametrization reproduces the global properties of the stars, by minimizing the errors in the observables of mass, radius, and the moment of inertia. We find that using piecewise polytropes and sampling the EOS with five fiducial densities between similar to 1-8 times the nuclear saturation density results in optimal errors for the smallest number of parameters. Specifically, it recreates the radii of the assumed EOS to within less than 0.5 km for the extreme mock EOS and to within less than 0.12 km for 95% of a sample of 42 proposed, physically motivated EOS. Such a parametrization is also able to reproduce the maximum mass to within 0.04 M-circle dot and the moment of inertia of a 1.338 M-circle dot. neutron star to within less than 10% for 95% of the proposed sample of EOS. |
author2 |
Univ Arizona, Dept Astron |
author_facet |
Univ Arizona, Dept Astron Raithel, Carolyn A. Özel, Feryal Psaltis, Dimitrios |
author |
Raithel, Carolyn A. Özel, Feryal Psaltis, Dimitrios |
author_sort |
Raithel, Carolyn A. |
title |
FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
title_short |
FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
title_full |
FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
title_fullStr |
FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
title_full_unstemmed |
FROM NEUTRON STAR OBSERVABLES TO THE EQUATION OF STATE. I. AN OPTIMAL PARAMETRIZATION |
title_sort |
from neutron star observables to the equation of state. i. an optimal parametrization |
publisher |
IOP PUBLISHING LTD |
publishDate |
2016 |
url |
http://hdl.handle.net/10150/622054 http://arizona.openrepository.com/arizona/handle/10150/622054 |
work_keys_str_mv |
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1718410122111221760 |