Improved proper motion and gravity tests with PSR J1913+1102
Rattachement africain : cn, de, dk, gb. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Context. PSR J1913+1102 is a highly asymmetric double neutron star (DNS) system, making it an excellent laboratory for testing scalar-tensor gravity theories and a potential progenitor analogue of GW170817 that will merge in 470 Myr. Aims. To maximise the utility of this system for testing gravity theories and to better understand its origin, we carried out timing measurements with the aim of refining the proper motion and post-Keplerian (PK) parameters. Methods. We performed an updated timing analysis of the system by combining 13 years of data, consisting of historical Arecibo observations and the latest FAST measurements. We applied two different approaches to model the dispersion measure (DM) variations. Results. The new timing analysis enables precise measurements of four PK parameters, leading to improved precision in mass estimates for the system. Assuming general relativity (GR) and modelling the DM variation with a Gaussian process, we obtained a three-fold improvement in the total mass, m tot = 2.88948(20) M ⊙ , and a nearly four-fold improvement in the pulsar mass m p = 1.599(8) M ⊙ , the companion mass, m c = 1.290(8) M ⊙ , and, thus, in the mass ratio, q = 0.807(8) as well. We also achieved an improved measurement of the system’s proper motion, μ = 7.71(25) mas yr −1 , enabling a more accurate determination of the non-intrinsic variation of the orbital period. This result, coupled with the improved measurement of the variation of the orbital period, leads to a refined measurement of the intrinsic variation of the orbital period, Ṗ b intr = −4.60(6) #x00D7; 10 −13 s s −1 . This value is five times more precise than the previously published value and is fully consistent with the GR prediction for gravitational-wave damping. The combination of the improved mass measurements and the precise value of Ṗ b intr allows us to place a stringent constraint on the emission of dipolar gravitational waves and on the spontaneous scalarisation window around 1.6 M ⊙ . Our new measurement of the proper motion indicates that there is still room for improvement in the precision of this radiative test in the near future. The refined proper motion and mass measurements also provide tighter constraints on the final helium-star mass (immediately prior to its core collapse and formation of the second NS in a supernova) as well as on the magnitude and direction of the associated natal kick of the DNS system.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Improved proper motion and gravity tests with PSR J1913+1102
- Date Crossref
- 28/08/2026
- Éditeur
- EDP Sciences
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Chinese Academy of Sciences National Astronomical Observatories pays non établi dans la noticeOrganisme public
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Max Planck Institute for Radio Astronomy pays non établi dans la noticeStructure de recherche
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National Astronomical Observatories pays non établi dans la noticeStructure de recherche
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Aalborg University Department of Materials and Production pays non établi dans la noticeUniversité ou école supérieure
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Henan Academy of Sciences pays non établi dans la noticeStructure de recherche
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Beijing Normal University Institute for Frontiers in Astronomy and Astrophysics pays non établi dans la noticeUniversité ou école supérieure
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University of East Anglia pays non établi dans la noticeUniversité ou école supérieure
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Technische Universität Dresden pays non établi dans la noticeUniversité ou école supérieure
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Max-Planck-Institut für Radioastronomie pays non établi dans la noticeStructure de recherche
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Institute for Gravitational Wave Astronomy pays non établi dans la noticeStructure de recherche
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Faculty of Science pays non établi dans la noticeUniversité ou école supérieure
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University of Manchester Department of Physics and Astronomy pays non établi dans la noticeUniversité ou école supérieure
National Astronomical Observatories — Chinese Academy of Sciences, Max Planck Institute for Radio Astronomy et National Astronomical Observatories, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.