Impact of Accretion Assumptions on Pulse Profile Modelling of Superburst Oscillations in 4U 1636-536
arXiv:2506.03033 · doi:10.1093/mnras/staf908
Abstract
Modelling the coherent pulsations observed during thermonuclear bursts offers a valuable method to probe the poorly understood equation of state of dense and cold matter. Here we apply the pulse profile modelling technique to the pulsations observed with RXTE during the 2001 superburst of 4U 1636536. By employing a single, uniform-temperature hot spot model with varying size and temperature, along with various assumptions for background/accretion contribution, we find that each assumption leads to different inferred mass, radius, and compactness constraints. This highlights the critical need to better understand the mass accretion rate enhancement/reduction during thermonuclear bursts to accurately model burst oscillation sources using pulse profile modelling.
Accepted for publication in MNRAS. The Zenodo link will be made public after the paper is published
References in corpus (39)
- The Gaia mission
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
- A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- A NICER View of the Nearest and Brightest Millisecond Pulsar: PSR J0437$\unicode{x2013}$4715
- An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451
- Neutron star mass and radius measurements from atmospheric model fits to X-ray burst cooling tail spectra
- The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
- Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star
- The Oblate Schwarzschild Approximation for Light Curves of Rapidly Rotating Neutron Stars
- Strongly interacting matter exhibits deconfined behavior in massive neutron stars
- A NICER view of PSR J0030+0451: evidence for a global-scale multipolar magnetic field
- X-ray bursting neutron star atmosphere models using an exact relativistic kinetic equation for Compton scattering
- The Radius of PSR J0740+6620 from NICER with NICER Background Estimates
- Rejecting proposed dense-matter equations of state with quiescent low-mass X-ray binaries
- Evidence for enhanced persistent emission during sub-Eddington thermonuclear bursts
- Accretion disks and coronae in the X-ray flashlight
- Constraining the dense matter equation of state with new NICER mass-radius measurements and new chiral effective field theory inputs
- A NICER View of PSR J12311411: A Complex Case
- Universality of the Acceleration Due to Gravity on the Surface of a Rapidly Rotating Neutron Star
- Detection of the Irradiated Donor in the LMXBs 4U 1636-536 (=V801 Ara) and 4U 1735-444 (=V926 Sco)
- What neutron stars tell about the hadron-quark phase transition: a Bayesian study
- The direct cooling tail method for X-ray burst analysis to constrain neutron star masses and radii
- A Bayesian inference of relativistic mean-field model for neutron star matter from observation of NICER and GW170817/AT2017gfo
- X-Raying an Accretion Disk in Realtime: the Evolution of Ionized Reflection during a Superburst from 4U 1636-536
- Constraining the Properties of the Thermonuclear Burst Oscillation Source XTE J1814-338 Through Pulse Profile Modelling
- Probing Quarkyonic Matter in Neutron Stars with the Bayesian Nuclear-Physics Multi-Messenger Astrophysics Framework
- Characterizing the Evolving X-Ray Spectral Features During a Superburst from 4U 1636-536
- X-ray burst induced spectral variability in 4U 1728-34
- A catalogue of unusually long thermonuclear bursts on neutron stars
- X-PSI Parameter Recovery for Temperature Map Configurations Inspired by PSR J0030+0451
- Relativistic ocean -modes during type-I X-ray bursts
- Pulse Profile Modeling of Thermonuclear Burst Oscillations I: The Effect of Neglecting Variability
- Constraining the magnetic field geometry of the millisecond pulsar PSR~J0030+0451 from joint radio, thermal X-ray and -ray emission
- X-ray burst ignition location on the surface of accreting X-ray pulsars: Can bursts preferentially ignite at the hotspot?
- Pulse Profile Modelling of Thermonuclear Burst Oscillations II: Handling variability
- Understanding superbursts
- Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921