Self-Trapping of Diskoseismic Corrugation Modes in Neutron Star Spacetimes
Abstract
We examine the effects of higher-order multipole contributions of rotating neutron star (NS) spacetimes on the propagation of corrugation (c-)modes within a thin accretion disk. We find that the Lense-Thirring precession frequency, which determines the propagation region of the low-frequency fundamental corrugation modes, can experience a turnover allowing for c-modes to become self-trapped for sufficiently high dimensionless spin j and quadrupole rotational deformability α. If such self-trapping c-modes can be detected, e.g., through phase-resolved spectroscopy of the iron line for a high-spin low-mass accreting neutron star, this could potentially constrain the spin-induced NS quadrupole and the NS equation of state.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 2016
- DOI:
- 10.3847/2041-8205/818/1/L11
- arXiv:
- arXiv:1511.01948
- Bibcode:
- 2016ApJ...818L..11T
- Keywords:
-
- accretion;
- accretion disks;
- equation of state;
- gravitation;
- relativistic processes;
- stars: neutron;
- X-rays: binaries;
- Astrophysics - High Energy Astrophysical Phenomena;
- General Relativity and Quantum Cosmology
- E-Print:
- 6 pages, 4 figures, submitted to ApJL