Stochastic processes for pulsar timing noise: fluctuations in the internal and external torques - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Stochastic processes for pulsar timing noise: fluctuations in the internal and external torques

Avishek Basu
  • Fonction : Auteur
Brynmor Haskell
  • Fonction : Auteur

Résumé

Young pulsars deviate from a perfectly regular spin-down by two non-deterministic phenomena: impulsive glitches and timing noise. Both phenomena are interesting per se, and may provide insights into the superfluid properties of neutron stars, but they also act as a barrier to high-precision pulsar timing and gravitational wave experiments. We study a minimal stochastic model to describe the spin-down of a multicomponent neutron star, with fluctuations in both the internal and external torques. The power spectral density and timing noise strength of this kind of model can be obtained analytically, and compared with known results from pulsar timing observational campaigns. In particular, the presence of flat regions of the power spectral density can be interpreted as a signature of the presence of internal superfluid components. We also derive the expected scaling of the timing noise strength with the pulsar's rotational parameters (or characteristic age). Therefore, the present framework offers a theoretical guideline to interpret the observed features of timing noise in both single pulsars and across pulsar population.

Dates et versions

hal-03711806 , version 1 (01-07-2022)

Identifiants

Citer

Marco Antonelli, Avishek Basu, Brynmor Haskell. Stochastic processes for pulsar timing noise: fluctuations in the internal and external torques. Monthly Notices of the Royal Astronomical Society, 2023, 520 (2), pp.2813-2828. ⟨10.1093/mnras/stad256⟩. ⟨hal-03711806⟩
24 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More