Three-dimensional general relativistic Poynting-Robertson effect. II. Radiation field from a rigidly rotating spherical source
Journal
Date Issued
2019
Author(s)
Bakala, Pavel
•
De Falco, Vittorio
•
Battista, Emmanuele
•
Goluchová, Kateřina
•
Lančová, Debora
•
Falanga, Maurizio
•
Abstract
We investigate the three-dimensional, general relativistic Poynting-Robertson (PR) effect in the case of rigidly rotating spherical source which emits radiation radially in the local comoving frame. Such radiation field is meant to approximate the field produced by the surface of a rotating neutron star, or by the central radiating hot corona of accreting black holes; it extends the purely radial radiation field that we considered in a previous study. Its angular momentum is expressed in terms of the rotation frequency and radius of the emitting source. For the background we adopt a Kerr spacetime geometry. We derive the equations of motion for test particles influenced by such radiation field, recovering the classical and weak-field approximation for slow rotation. We concentrate on solutions consisting of particles orbiting along circular orbits off and parallel to the equatorial plane, which are stabilized by the balance between gravitational attraction, radiation force and PR drag. Such solutions are found to lie on a critical hypersurface, whose shape may morph from prolate to oblate depending on the Kerr spin parameter and the luminosity, rotation and radius of the radiating sphere. For selected parameter ranges, the critical hypersurface intersects the radiating sphere giving rise to a bulging equatorial region or, alternatively, two lobes above the poles. We calculate the trajectories of test particles in the close vicinity of the critical hypersurface for a selected set of initial parameters and analyze the spatial and angular velocity of test particles captured on the critical hypersurface.
Volume
100
Issue
10
Start page
104053
Issn Identifier
2470-0010
Ads BibCode
2019PhRvD.100j4053B
Rights
open.access
File(s)![Thumbnail Image]()
![Thumbnail Image]()
Loading...
Name
1911.00540.pdf
Description
postprint
Size
6.19 MB
Format
Adobe PDF
Checksum (MD5)
9cb367ce080627a0251b219fd096966e
Loading...
Name
PhysRevD.100.104053.pdf
Description
pdf editoriale
Size
2.96 MB
Format
Adobe PDF
Checksum (MD5)
26d3767607ec0a5b96d94846060d0e7b