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Exploring Waveform Variations among Neutron Star Ray-tracing Codes for Complex Emission Geometries

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arxiv 2406.07285 v2 pith:LCWDRNC7 submitted 2024-06-11 astro-ph.HE gr-qc

Exploring Waveform Variations among Neutron Star Ray-tracing Codes for Complex Emission Geometries

Devarshi Choudhury , Anna L. Watts , Alexander J. Dittmann , M. Coleman Miller , Sharon M. Morsink , Tuomo Salmi , Serena Vinciguerra , Slavko Bogdanov
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Sebastien Guillot Michael T. Wolff Zaven Arzoumanian
This is my paper
classification astro-ph.HE gr-qc
keywords geometriesneutronnicerray-tracingstaranalysescodescomplex
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Pulse Profile Modeling (PPM), the technique used to infer mass, radius and geometric parameters for rotation-powered millisecond pulsars using data from the Neutron Star Interior Composition Explorer (NICER), relies on relativistic ray-tracing of thermal X-ray photons from hot spots on the neutron star surface to the observer. To verify our ray-tracing codes we have in the past conducted cross-tests for simple hot spot geometries, focusing primarily on the implementation of the space-time model. In this paper, we present verification for test problems that explore the more complex hot spot geometries that are now being employed in the NICER PPM analyses. We conclude that the accuracy of our computed waveforms is in general sufficiently high for analyses of current NICER data sets. We have however identified some extreme configurations where extra care may be needed.

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Cited by 1 Pith paper

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  1. A NICER view of the millisecond pulsar PSR J2124$-$3358: evidence for a helium atmosphere

    astro-ph.HE 2026-07 conditional novelty 5.5

    X-PSI modeling of NICER/Chandra data for PSR J2124−3358 substantially prefers a helium atmosphere, giving M = 1.8 ± 0.5 M⊙ and Req = 11.7^{+2.6}_{-3.0} km with two slightly non-antipodal hot spots.