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Periodic interstellar scintillation variations of PSRs J0613–0200 and J0636+5128 associated with the Local Bubble shell

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Abstract

Annual variations of interstellar scintillation can be modelled to constrain parameters of the ionized interstellar medium. If a pulsar is in a binary system, then investigating the orbital parameters is possible through analysis of the orbital variation of scintillation. In observations carried out from 2011 to 2020 by the European Pulsar Timing Array radio telescopes, PSRs J0613–0200 and J0636+5128 show strong annual variations in their scintillation velocity, while the former additionally exhibits an orbital fluctuation. Bayesian theory and Markov-chain-Monte-Carlo methods are used to interpret these periodic variations. We assume a thin and anisotropic scattering screen model, and discuss the mildly and extremely anisotropic scattering cases. PSR J0613–0200 is best described by mildly anisotropic scattering, while PSR J0636+5128 exhibits extremely anisotropic scattering. We measure the distance, velocity, and degree of anisotropy of the scattering screen for our two pulsars, finding that scattering screen distances from Earth for PSRs J0613–0200 and J0636+5128 are 316 +28−20 pc and 262 +96−38 pc, respectively. The positions of these scattering screens are coincident with the shell of the Local Bubble towards both pulsars. These associations add to the growing evidence of the Local Bubble shell as a dominant region of scattering along many sightlines.

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Authors and Affiliations

  1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, China

    Yulan Liu, Ziwei Wu & Jiguang Lu

  2. Fakultät für Physik, Universität Bielefeld, Bielefeld, 33501, Germany

    Yulan Liu, Joris P. W. Verbiest, Ziwei Wu & Krishnakumar M. Ambalappat

  3. Max-Planck-Institut für Radioastronomie, Bonn, 53121, Germany

    Robert A. Main, Joris P. W. Verbiest, Krishnakumar M. Ambalappat, David J. Champion, Kuo Liu & Nataliya Porayko

  4. Florida Space Institute, University of Central Florida, Orlando, FL, 32826, USA

    Joris P. W. Verbiest

  5. Station de radioastronomie de Nançay, Observatoire de Paris, Nançay, 18330, France

    Ismaël Cognard, Lucas Guillemot & Gilles Theureau

  6. Laboratoire de Physique et Chimie de l’Environnement et de l’Espace, Université d’Orléans, Orléans, 45071, France

    Ismaël Cognard, Lucas Guillemot & Gilles Theureau

  7. E.A. Milne Centre for Astrophysics, University of Hull, Hull, HU6 7RX, UK

    James W. McKee

  8. Centre of Excellence for Data Science, Artificial Intelligence and Modelling, University of Hull, Hull, HU6 7RX, UK

    James W. McKee

  9. Dipartimento di Fisica “G. Occhialini”, Università di Milano-Bicocca, Milano, 20126, Italy

    Nataliya Porayko & Golam M. Shaifullah

  10. INAF - Osservatorio Astronomico di Cagliari, Selargius (CA), 09047, Italy

    Golam M. Shaifullah

  11. INFN, Sezione di Milano-Bicocca, Milano, 20126, Italy

    Golam M. Shaifullah

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  1. Yulan Liu
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Corresponding author

Correspondence to Yulan Liu.

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

We thank Bill Coles for many useful discussion and suggestions. This work was supported by the National Natural Science Foundation of China (Grant No. 12003047), the Major Science and Technology Program of Xinjiang Uygur Autonomous Region (Grant No. 2022A03013-2), and the Natural Science Foundation of Xinjiang Uygur Autonomous Region (Grant No. 2022D01D85). Joris P. W. Verbiest acknowledges support by the Deutsche Forschungsgemeinschaft (DFG) through the Heisenberg programme (Project No. 433075039). Part of this work is based on observations with the 100-m radio telescope of the Max-Planck-Institut für Radioastronomie (MPIfR) at Effelsberg in Germany. Pulsar research at the Jodrell Bank Centre for Astrophysics and the observations using the Lovell Telescope are supported by a consolidated grant from the STFC in the UK. The Nançay Radio Observatory is operated by the Paris Observatory, associated with the French Centre National de la Recherche Scientifique (CNRS). We acknowledge financial support from “Programme National de Cosmologie et Galaxies” (PNCG) of CNRS/INSU, France.

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Liu, Y., Main, R.A., Verbiest, J.P.W. et al. Periodic interstellar scintillation variations of PSRs J0613–0200 and J0636+5128 associated with the Local Bubble shell. Sci. China Phys. Mech. Astron. 66, 119512 (2023). https://doi.org/10.1007/s11433-023-2182-6

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