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A freely precessing magnetar following an X-ray outburst.
Desvignes, Gregory; Weltevrede, Patrick; Gao, Yong; Jones, David Ian; Kramer, Michael; Caleb, Manisha; Karuppusamy, Ramesh; Levin, Lina; Liu, Kuo; Lyne, Andrew G; Shao, Lijing; Stappers, Ben; Pétri, Jérôme.
Afiliación
  • Desvignes G; Max-Planck-Institut für Radioastronomie, Bonn, Germany.
  • Weltevrede P; Laboratoire d'Études Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, Université Paris-Sciences-et-Lettres, Centre National de la Recherche Scientifique, Sorbonne Université, Université de Paris, Meudon, France.
  • Gao Y; Jodrell Bank Centre for Astrophysics, The University of Manchester, Manchester, UK.
  • Jones DI; Department of Astronomy, School of Physics, Peking University, Beijing, China.
  • Kramer M; Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, China.
  • Caleb M; Mathematical Sciences and STAG Research Centre, University of Southampton, Southampton, UK.
  • Karuppusamy R; Max-Planck-Institut für Radioastronomie, Bonn, Germany.
  • Levin L; Jodrell Bank Centre for Astrophysics, The University of Manchester, Manchester, UK.
  • Liu K; Sydney Institute for Astronomy, School of Physics, The University of Sydney, Sydney, New South Wales Australia.
  • Lyne AG; ASTRO3D: ARC Centre of Excellence for All-sky Astrophysics in 3D, Canberra, Australian Capital Territory Australia.
  • Shao L; Max-Planck-Institut für Radioastronomie, Bonn, Germany.
  • Stappers B; Jodrell Bank Centre for Astrophysics, The University of Manchester, Manchester, UK.
  • Pétri J; Max-Planck-Institut für Radioastronomie, Bonn, Germany.
Nat Astron ; 8(5): 617-627, 2024.
Article en En | MEDLINE | ID: mdl-38798716
ABSTRACT
Magnetars-highly magnetized neutron stars-are thought to be the most likely progenitors for fast radio bursts (FRBs). Freely precessing magnetars are further invoked to explain the repeating FRBs. We report here on new high-cadence radio observations of the magnetar XTE J1810-197 recorded shortly after an X-ray outburst. We interpret the polarization variations of the magnetar radio emission as evidence for the magnetar undergoing free precession following the outburst while its magnetosphere slowly untwists. The observations of precession being damped on a timescale of months argue against the scenario of freely precessing magnetars as the origin of repeating FRBs. Using free-precession models based on relaxing ellipticity with a decay of the wobble angle, we find the magnetar ellipticity to be in good agreement with theoretical predictions from nuclear physics. Our precise measurement of the magnetar's geometry can also further help in refining the modelling of X-ray light curves and constrain the star's compactness.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Astron Año: 2024 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Astron Año: 2024 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido