Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars
We report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar companions. We fitted each individual pulse profile wi...
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2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9399 |
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| author | Silas G. T. Laycock Rigel C. Cappallo Pragati Pradhan Dimitris M. Christodoulou Biswajit Paul |
| author_facet | Silas G. T. Laycock Rigel C. Cappallo Pragati Pradhan Dimitris M. Christodoulou Biswajit Paul |
| author_sort | Silas G. T. Laycock |
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| description | We report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar companions. We fitted each individual pulse profile with the Polestar geometric model, which accounts for X-ray emission from two hot spots modeled as a simple combination of fan+pencil beam components, including an approximation for gravitational light bending. In 14 of 21 cases, our measurements of the inclinations of the pulsar spin axes broadly agree with the corresponding inclinations of the orbital planes of the binary systems determined by various other means, a striking outcome with a mere 6 × 10 ^−7 probability of occurring by chance. The implications of our study are as follows: (a) apparently, accretion torques have had time to erase spin–orbit misalignment caused by supernova kicks in two-thirds of the systems; (b) many X-ray binary pulsars have dominant dipolar surface magnetic fields, in contrast to the recently reported exotic configurations in millisecond pulsars; and (c) if the binary inclinations can be determined by pulse-profile modeling, even for a subset of the ∼200 known X-ray binary pulsars, most of which orbital inclinations are as yet poorly constrained, it raises the prospect of tightening dramatically ongoing neutron-star mass determinations. This is because masses in binary systems overwhelmingly come from an orbital-mechanics formulation (Kepler’s third law), in which the dominant source of uncertainty is the inclination of the orbital plane. |
| format | Article |
| id | doaj-art-8611d94eb2f148bd869b5f9099e67825 |
| institution | Kabale University |
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| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-8611d94eb2f148bd869b5f9099e678252025-01-08T09:57:53ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197818010.3847/1538-4357/ad9399Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary PulsarsSilas G. T. Laycock0https://orcid.org/0000-0002-8427-0766Rigel C. Cappallo1https://orcid.org/0000-0003-0267-8432Pragati Pradhan2https://orcid.org/0000-0002-1131-3059Dimitris M. Christodoulou3https://orcid.org/0000-0002-7652-2206Biswajit Paul4https://orcid.org/0000-0002-8775-5945University of Massachusetts Lowell , Kennedy College of Sciences, Lowell, MA, 01854, USA; Lowell Center for Space Science and Technology , Lowell, MA, 01854, USAMassachusetts Institute of Technology , Haystack Observatory, Westford, MA, 01886, USAMassachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research , Cambridge, MA, 02139, USA; Embry-Riddle Aeronautical University , 3700 Willow Creek Road, Prescott, AZ, 86301, USAUniversity of Massachusetts Lowell , Kennedy College of Sciences, Lowell, MA, 01854, USA; Lowell Center for Space Science and Technology , Lowell, MA, 01854, USARaman Research Institute , Astronomy and Astrophysics, Bangalore, 560080, IndiaWe report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar companions. We fitted each individual pulse profile with the Polestar geometric model, which accounts for X-ray emission from two hot spots modeled as a simple combination of fan+pencil beam components, including an approximation for gravitational light bending. In 14 of 21 cases, our measurements of the inclinations of the pulsar spin axes broadly agree with the corresponding inclinations of the orbital planes of the binary systems determined by various other means, a striking outcome with a mere 6 × 10 ^−7 probability of occurring by chance. The implications of our study are as follows: (a) apparently, accretion torques have had time to erase spin–orbit misalignment caused by supernova kicks in two-thirds of the systems; (b) many X-ray binary pulsars have dominant dipolar surface magnetic fields, in contrast to the recently reported exotic configurations in millisecond pulsars; and (c) if the binary inclinations can be determined by pulse-profile modeling, even for a subset of the ∼200 known X-ray binary pulsars, most of which orbital inclinations are as yet poorly constrained, it raises the prospect of tightening dramatically ongoing neutron-star mass determinations. This is because masses in binary systems overwhelmingly come from an orbital-mechanics formulation (Kepler’s third law), in which the dominant source of uncertainty is the inclination of the orbital plane.https://doi.org/10.3847/1538-4357/ad9399Pulsars |
| spellingShingle | Silas G. T. Laycock Rigel C. Cappallo Pragati Pradhan Dimitris M. Christodoulou Biswajit Paul Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars The Astrophysical Journal Pulsars |
| title | Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars |
| title_full | Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars |
| title_fullStr | Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars |
| title_full_unstemmed | Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars |
| title_short | Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars |
| title_sort | pulse profile modeling and spin orbit alignment in a suzaku sample of accreting x ray binary pulsars |
| topic | Pulsars |
| url | https://doi.org/10.3847/1538-4357/ad9399 |
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