Fine structure of the Poynting-Robertson effect for a luminous spinning relativistic star

TL;DR

This paper investigates the detailed behavior of test particles near a luminous spinning relativistic star, revealing unexpected increases in angular momentum as particles approach the suspension orbit, with implications for accretion flow modeling.

Contribution

It provides a detailed analysis of test particle trajectories near the suspension orbit, highlighting a surprising angular momentum increase contrary to previous expectations.

Findings

Test particles exhibit an unexpected increase in angular momentum near the suspension orbit.

The trajectory analysis challenges prior assumptions about particle behavior in strong radiation fields.

Results have potential implications for understanding accretion flows around luminous spinning stars.

Abstract

As a sequel to our recent works challenging toward the systematic inclusion of the effect of radiation on the trajectory of a test particle orbiting around a luminous spinning relativistic star eventually aiming at its application to the accretion flow. We explore in the present work the fine structure of the trajectory of test particle just entering the ``suspension orbit" under the purpose of a detailed investigation of test particle's trajectory in the vicinity of the ``suspension orbit". We end up with a rather puzzling behavior that, contrary to our expectation, the specific angular momentum of the test particle instantly rises instead of decreasing monotonically just before the test particle enters the ``suspension orbit".