Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star

Slavko Bogdanov; Frederick K. Lamb; Simin Mahmoodifar; M. Coleman Miller; Sharon M. Morsink; Thomas E. Riley; Tod E. Strohmayer; Albert K. Tung; Anna L. Watts; Alexander J. Dittmann; Deepto Chakrabarty; Sebastien Guillot; Zaven Arzoumanian; Keith C. Gendreau

doi:10.3847/2041-8213/ab5968

Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star

Slavko Bogdanov, Frederick K. Lamb, Simin Mahmoodifar, M. Coleman Miller, Sharon M. Morsink, Thomas E. Riley, Tod E. Strohmayer, Albert K. Tung, Anna L. Watts, Alexander J. Dittmann, Deepto Chakrabarty, Sebastien Guillot, Zaven Arzoumanian, Keith C. Gendreau

Physics

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Abstract

We describe the model of surface emission from a rapidly rotating neutron star that is applied to Neutron Star Interior Composition Explorer X-ray data of millisecond pulsars in order to statistically constrain the neutron star mass-radius relation and dense matter equation of state. To ensure that the associated calculations are both accurate and precise, we conduct an extensive suite of verification tests between our numerical codes for both the Schwarzschild + Doppler and Oblate Schwarzschild approximations, and compare both approximations against exact numerical calculations. We find superb agreement between the code outputs, as well as in comparisons against a set of analytical and semi-analytical calculations, which, combined with their speed, demonstrates that the codes are well suited for large-scale statistical sampling applications. A set of verified, high-precision reference synthetic pulse profiles is provided to the community to facilitate testing of other independently developed codes.

Original language	English (US)
Article number	L26
Journal	Astrophysical Journal Letters
Volume	887
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/ab5968
State	Published - Dec 10 2019

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/ab5968

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Bogdanov, S., Lamb, F. K., Mahmoodifar, S., Miller, M. C., Morsink, S. M., Riley, T. E., Strohmayer, T. E., Tung, A. K., Watts, A. L., Dittmann, A. J., Chakrabarty, D., Guillot, S., Arzoumanian, Z., & Gendreau, K. C. (2019). Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star. Astrophysical Journal Letters, 887(1), Article L26. https://doi.org/10.3847/2041-8213/ab5968

Bogdanov, S, Lamb, FK, Mahmoodifar, S, Miller, MC, Morsink, SM, Riley, TE, Strohmayer, TE, Tung, AK, Watts, AL, Dittmann, AJ, Chakrabarty, D, Guillot, S, Arzoumanian, Z & Gendreau, KC 2019, 'Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star', Astrophysical Journal Letters, vol. 887, no. 1, L26. https://doi.org/10.3847/2041-8213/ab5968

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abstract = "We describe the model of surface emission from a rapidly rotating neutron star that is applied to Neutron Star Interior Composition Explorer X-ray data of millisecond pulsars in order to statistically constrain the neutron star mass-radius relation and dense matter equation of state. To ensure that the associated calculations are both accurate and precise, we conduct an extensive suite of verification tests between our numerical codes for both the Schwarzschild + Doppler and Oblate Schwarzschild approximations, and compare both approximations against exact numerical calculations. We find superb agreement between the code outputs, as well as in comparisons against a set of analytical and semi-analytical calculations, which, combined with their speed, demonstrates that the codes are well suited for large-scale statistical sampling applications. A set of verified, high-precision reference synthetic pulse profiles is provided to the community to facilitate testing of other independently developed codes.",

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AU - Lamb, Frederick K.

AU - Mahmoodifar, Simin

AU - Miller, M. Coleman

AU - Morsink, Sharon M.

AU - Riley, Thomas E.

AU - Strohmayer, Tod E.

AU - Tung, Albert K.

AU - Watts, Anna L.

AU - Dittmann, Alexander J.

AU - Chakrabarty, Deepto

AU - Guillot, Sebastien

AU - Arzoumanian, Zaven

AU - Gendreau, Keith C.

PY - 2019/12/10

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AB - We describe the model of surface emission from a rapidly rotating neutron star that is applied to Neutron Star Interior Composition Explorer X-ray data of millisecond pulsars in order to statistically constrain the neutron star mass-radius relation and dense matter equation of state. To ensure that the associated calculations are both accurate and precise, we conduct an extensive suite of verification tests between our numerical codes for both the Schwarzschild + Doppler and Oblate Schwarzschild approximations, and compare both approximations against exact numerical calculations. We find superb agreement between the code outputs, as well as in comparisons against a set of analytical and semi-analytical calculations, which, combined with their speed, demonstrates that the codes are well suited for large-scale statistical sampling applications. A set of verified, high-precision reference synthetic pulse profiles is provided to the community to facilitate testing of other independently developed codes.

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Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star

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