Tracking hidden magnetospheric fluctuations in accretion-powered pulsars with a Kalman filter
arXiv:2212.08185 · doi:10.3847/1538-4357/acab5a
Abstract
X-ray flux and pulse period fluctuations in an accretion-powered pulsar convey important information about the disk-magnetosphere interaction. It is shown that simultaneous flux and period measurements can be analysed with a Kalman filter based on the standard magnetocentrifugal accretion torque to generate accurate time-dependent estimates of three hidden state variables, which fluctuate stochastically and cannot be measured directly: the mass accretion rate, the Maxwell stress at the disk-magnetosphere boundary, and the radiative efficiency of accretion onto the stellar surface. The inferred fluctuation statistics carry implications for the physics of hydromagnetic instabilities at the disk-magnetosphere boundary and searches for continuous gravitational radiation from low-mass X-ray binaries.
49 pages, 6 figures, accepted for publication in The Astrophysical Journal
References in corpus (20)
- Detecting gravitational wave emission from the known accreting neutron stars
- Accretion to Magnetized Stars through the Rayleigh-Taylor Instability: Global Three-Dimensional Simulations
- Detecting gravitational waves from mountains on neutron stars in the Advanced Detector Era
- Accretion-Powered Stellar Winds III: Spin Equilibrium Solutions
- X-ray outbursts of low-mass X-ray binary transients observed in the RXTE era
- Super-Eddington accretion discs with advection and outflows around magnetized neutron stars
- Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking
- Magnetic fields of neutron stars in X-ray binaries
- Spin up and phase fluctuations in the timing of the accreting millisecond pulsar XTE J1807-294
- Model-Based Cross-Correlation Search for Gravitational Waves from Scorpius X-1
- GRMHD Simulations of Accreting Neutron Stars with Non-Dipole Fields
- Search for gravitational waves from five low mass X-ray binaries in the second Advanced LIGO observing run with an improved hidden Markov model
- Indications of non-conservative mass-transfer in AMXPs
- Hidden Markov model tracking of continuous gravitational waves from a neutron star with wandering spin. III. Rotational phase tracking
- Parameter estimation of a two-component neutron star model with spin wandering
- Rapid parameter estimation of a two-component neutron star model with spin wandering using a Kalman filter
- Magnetic Braking of Accreting T Tauri Stars II: Torque Formulation Spanning Spin-Up and Spin-Down Regimes
- Revisiting Evidence of Chaos in X-ray Light Curves: The Case of GRS 1915+105
- Reversibility of time series: revealing the hidden messages in X-ray binaries and cataclysmic variables
- Pulse Frequency Fluctuations of Persistent Accretion Powered Pulsars
Cited by in corpus (4)
- Measuring the magnetic dipole moment and magnetospheric fluctuations of SXP 18.3 with a Kalman filter
- Observing Rayleigh-Taylor stable and unstable accretion through a Kalman filter analysis of X-ray pulsars in the Small Magellanic Cloud
- Measuring the magnetic dipole moment and magnetospheric fluctuations of accretion-powered pulsars in the Small Magellanic Cloud with an unscented Kalman filter
- How much spin wandering can continuous gravitational wave search algorithms handle?